{"id":69634,"date":"2025-07-15T07:17:50","date_gmt":"2025-07-15T00:17:50","guid":{"rendered":"https:\/\/itsystems.vn\/virus-infected-computer-10-warning-signs-how-to-handle-it\/"},"modified":"2026-07-29T11:49:12","modified_gmt":"2026-07-29T04:49:12","slug":"virus-infected-computer-10-warning-signs-how-to-handle-it","status":"publish","type":"post","link":"https:\/\/itsystems.vn\/en\/virus-infected-computer-10-warning-signs-how-to-handle-it\/","title":{"rendered":"Virus Infected Computer: 10+ Warning Signs &#038; How to Handle It"},"content":{"rendered":"<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_86 counter-hierarchy ez-toc-counter ez-toc-light-blue ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">The content of the article<\/p>\n<span class=\"ez-toc-title-toggle\"><a href=\"#\" class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" aria-label=\"Toggle Table of Content\"><span class=\"ez-toc-js-icon-con\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #999;color:#999\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewBox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #999;color:#999\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewBox=\"0 0 24 24\" version=\"1.2\" baseProfile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/span><\/a><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1 ' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/itsystems.vn\/en\/virus-infected-computer-10-warning-signs-how-to-handle-it\/#Why_Early_Detection_of_Virus-Infected_Computers_is_Important\" >Why Early Detection of Virus-Infected Computers is Important?<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/itsystems.vn\/en\/virus-infected-computer-10-warning-signs-how-to-handle-it\/#Risk_of_Data_Loss\" >Risk of Data Loss<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/itsystems.vn\/en\/virus-infected-computer-10-warning-signs-how-to-handle-it\/#Impact_on_Computer_Performance\" >Impact on Computer Performance<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/itsystems.vn\/en\/virus-infected-computer-10-warning-signs-how-to-handle-it\/#Risks_to_Personal_Information_Security\" >Risks to Personal Information Security<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/itsystems.vn\/en\/virus-infected-computer-10-warning-signs-how-to-handle-it\/#CHECK_NOW_10_Warning_Signs_of_a_Virus-Infected_Computer\" >[CHECK NOW] 10+ Warning Signs of a Virus-Infected Computer<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/itsystems.vn\/en\/virus-infected-computer-10-warning-signs-how-to-handle-it\/#Computer_Running_Abnormally_Slow\" >Computer Running Abnormally Slow<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/itsystems.vn\/en\/virus-infected-computer-10-warning-signs-how-to-handle-it\/#Unexpected_Ads_or_Continuous_Pop-Ups\" >Unexpected Ads or Continuous Pop-Ups<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/itsystems.vn\/en\/virus-infected-computer-10-warning-signs-how-to-handle-it\/#Programs_Automatically_Launching_or_Closing\" >Programs Automatically Launching or Closing<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"https:\/\/itsystems.vn\/en\/virus-infected-computer-10-warning-signs-how-to-handle-it\/#Files_Missing_Damaged_or_Encrypted\" >Files Missing, Damaged, or Encrypted<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-10\" href=\"https:\/\/itsystems.vn\/en\/virus-infected-computer-10-warning-signs-how-to-handle-it\/#Hard_Drive_Continuously_Running_Even_When_Not_in_Use\" >Hard Drive Continuously Running Even When Not in Use<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-11\" href=\"https:\/\/itsystems.vn\/en\/virus-infected-computer-10-warning-signs-how-to-handle-it\/#Firewall_or_Antivirus_Software_Automatically_Disabled\" >Firewall or Antivirus Software Automatically Disabled<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-12\" href=\"https:\/\/itsystems.vn\/en\/virus-infected-computer-10-warning-signs-how-to-handle-it\/#Emails_Sent_Automatically_from_Your_Account\" >Emails Sent Automatically from Your Account<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-13\" href=\"https:\/\/itsystems.vn\/en\/virus-infected-computer-10-warning-signs-how-to-handle-it\/#Homepage_of_Browser_Changed\" >Homepage of Browser Changed<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-14\" href=\"https:\/\/itsystems.vn\/en\/virus-infected-computer-10-warning-signs-how-to-handle-it\/#Unfamiliar_Icons_Appearing_on_the_Screen\" >Unfamiliar Icons Appearing on the Screen<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-15\" href=\"https:\/\/itsystems.vn\/en\/virus-infected-computer-10-warning-signs-how-to-handle-it\/#Computer_Frequently_Freezing_or_Restarting\" >Computer Frequently Freezing or Restarting<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-16\" href=\"https:\/\/itsystems.vn\/en\/virus-infected-computer-10-warning-signs-how-to-handle-it\/#DETAIL_Explanation_of_Virus_Warning_Signs_on_Computers\" >[DETAIL] Explanation of Virus Warning Signs on Computers<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-17\" href=\"https:\/\/itsystems.vn\/en\/virus-infected-computer-10-warning-signs-how-to-handle-it\/#Technical_Analysis_of_Each_Sign\" >Technical Analysis of Each Sign<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-18\" href=\"https:\/\/itsystems.vn\/en\/virus-infected-computer-10-warning-signs-how-to-handle-it\/#Why_Do_Viruses_Cause_Such_Symptoms\" >Why Do Viruses Cause Such Symptoms?<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-19\" href=\"https:\/\/itsystems.vn\/en\/virus-infected-computer-10-warning-signs-how-to-handle-it\/#IMPORTANT_Distinguishing_Virus_Symptoms_from_Other_Software_Errors\" >[IMPORTANT] Distinguishing Virus Symptoms from Other Software Errors<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-20\" href=\"https:\/\/itsystems.vn\/en\/virus-infected-computer-10-warning-signs-how-to-handle-it\/#When_to_Suspect_a_Virus\" >When to Suspect a Virus?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-21\" href=\"https:\/\/itsystems.vn\/en\/virus-infected-computer-10-warning-signs-how-to-handle-it\/#Steps_to_Check_for_Determining_Causes\" >Steps to Check for Determining Causes<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-22\" href=\"https:\/\/itsystems.vn\/en\/virus-infected-computer-10-warning-signs-how-to-handle-it\/#EMERGENCY_What_to_Do_If_Your_Computer_is_Infected_with_a_Virus\" >[EMERGENCY] What to Do If Your Computer is Infected with a Virus?<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-23\" href=\"https:\/\/itsystems.vn\/en\/virus-infected-computer-10-warning-signs-how-to-handle-it\/#Disconnect_Internet_Immediately\" >Disconnect Internet Immediately<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-24\" href=\"https:\/\/itsystems.vn\/en\/virus-infected-computer-10-warning-signs-how-to-handle-it\/#Use_Trusted_Antivirus_Software_to_Scan\" >Use Trusted Antivirus Software to Scan<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-25\" href=\"https:\/\/itsystems.vn\/en\/virus-infected-computer-10-warning-signs-how-to-handle-it\/#Restore_the_System_to_a_Time_Before_the_Infection\" >Restore the System to a Time Before the Infection<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-26\" href=\"https:\/\/itsystems.vn\/en\/virus-infected-computer-10-warning-signs-how-to-handle-it\/#Reinstall_the_Operating_System_in_the_worst-case_scenario\" >Reinstall the Operating System (in the worst-case scenario)<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-27\" href=\"https:\/\/itsystems.vn\/en\/virus-infected-computer-10-warning-signs-how-to-handle-it\/#PREVENTION_Most_Effective_Ways_to_Protect_Computers_from_Viruses\" >[PREVENTION] Most Effective Ways to Protect Computers from Viruses<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-28\" href=\"https:\/\/itsystems.vn\/en\/virus-infected-computer-10-warning-signs-how-to-handle-it\/#Install_and_Update_Antivirus_Software_Regularly\" >Install and Update Antivirus Software Regularly<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-29\" href=\"https:\/\/itsystems.vn\/en\/virus-infected-computer-10-warning-signs-how-to-handle-it\/#Be_Cautious_When_Downloading_Files_from_the_Internet\" >Be Cautious When Downloading Files from the Internet<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-30\" href=\"https:\/\/itsystems.vn\/en\/virus-infected-computer-10-warning-signs-how-to-handle-it\/#Do_Not_Open_Strange_Emails_or_Links\" >Do Not Open Strange Emails or Links<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-31\" href=\"https:\/\/itsystems.vn\/en\/virus-infected-computer-10-warning-signs-how-to-handle-it\/#Use_a_Firewall\" >Use a Firewall<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-32\" href=\"https:\/\/itsystems.vn\/en\/virus-infected-computer-10-warning-signs-how-to-handle-it\/#Regularly_Back_Up_Data\" >Regularly Back Up Data<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-33\" href=\"https:\/\/itsystems.vn\/en\/virus-infected-computer-10-warning-signs-how-to-handle-it\/#SUGGESTIONS_Top_5_Best_Antivirus_Software_Available_Today\" >[SUGGESTIONS] Top 5 Best Antivirus Software Available Today<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-34\" href=\"https:\/\/itsystems.vn\/en\/virus-infected-computer-10-warning-signs-how-to-handle-it\/#Comparing_Features_Advantages_and_Disadvantages\" >Comparing Features, Advantages, and Disadvantages<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-35\" href=\"https:\/\/itsystems.vn\/en\/virus-infected-computer-10-warning-signs-how-to-handle-it\/#Free_vs_Paid_Antivirus_Software_Which_Should_You_Choose\" >Free vs. Paid Antivirus Software: Which Should You Choose?<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-36\" href=\"https:\/\/itsystems.vn\/en\/virus-infected-computer-10-warning-signs-how-to-handle-it\/#Q_A_Frequently_Asked_Questions_About_Computer_Viruses\" >[Q&amp;A] Frequently Asked Questions About Computer Viruses<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-37\" href=\"https:\/\/itsystems.vn\/en\/virus-infected-computer-10-warning-signs-how-to-handle-it\/#How_Do_Computer_Viruses_Spread\" >How Do Computer Viruses Spread?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-38\" href=\"https:\/\/itsystems.vn\/en\/virus-infected-computer-10-warning-signs-how-to-handle-it\/#Is_Installing_Antivirus_Software_Always_100_Safe\" >Is Installing Antivirus Software Always 100% Safe?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-39\" href=\"https:\/\/itsystems.vn\/en\/virus-infected-computer-10-warning-signs-how-to-handle-it\/#Can_a_Mac_Get_Infected_with_a_Virus\" >Can a Mac Get Infected with a Virus?<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-40\" href=\"https:\/\/itsystems.vn\/en\/virus-infected-computer-10-warning-signs-how-to-handle-it\/#CONCLUSION_Protecting_Your_Computer_from_Viruses_Investing_in_Safety\" >[CONCLUSION] Protecting Your Computer from Viruses: Investing in Safety<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-41\" href=\"https:\/\/itsystems.vn\/en\/virus-infected-computer-10-warning-signs-how-to-handle-it\/#Related_services_from_IT_Systems\" >Related services from IT Systems<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-42\" href=\"https:\/\/itsystems.vn\/en\/virus-infected-computer-10-warning-signs-how-to-handle-it\/#FAQ\" >FAQ<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-43\" href=\"https:\/\/itsystems.vn\/en\/virus-infected-computer-10-warning-signs-how-to-handle-it\/#When_should_a_business_ask_IT_Systems_for_support\" >When should a business ask IT Systems for support?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-44\" href=\"https:\/\/itsystems.vn\/en\/virus-infected-computer-10-warning-signs-how-to-handle-it\/#Can_IT_Systems_help_review_the_current_environment_before_proposing_a_solution\" >Can IT Systems help review the current environment before proposing a solution?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-45\" href=\"https:\/\/itsystems.vn\/en\/virus-infected-computer-10-warning-signs-how-to-handle-it\/#Does_this_topic_connect_to_ongoing_IT_operations\" >Does this topic connect to ongoing IT operations?<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-46\" href=\"https:\/\/itsystems.vn\/en\/virus-infected-computer-10-warning-signs-how-to-handle-it\/#Need_help_applying_this_to_your_business\" >Need help applying this to your business?<\/a><\/li><\/ul><\/nav><\/div>\n<h2><span class=\"ez-toc-section\" id=\"Why_Early_Detection_of_Virus-Infected_Computers_is_Important\"><\/span>Why Early Detection of Virus-Infected Computers is Important?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Early detection of virus-infected computers is crucial for protecting data and system performance. When your computer encounters a virus, not only can performance suffer, but personal data can also be severely damaged.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Risk_of_Data_Loss\"><\/span>Risk of Data Loss<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>When a computer is infected with a virus, files can be deleted, altered, or encrypted, leading to a risk of losing important information. Users may lose all documents, images, or videos that cannot be recovered.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Impact_on_Computer_Performance\"><\/span>Impact on Computer Performance<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Viruses often cause computers to run slowly, restart, or hang frequently. This is not only frustrating but also affects your daily tasks.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Risks_to_Personal_Information_Security\"><\/span>Risks to Personal Information Security<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>When a computer is infected with a virus, personal information such as bank accounts, passwords, or personal records may be stolen and exploited for malicious purposes.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"CHECK_NOW_10_Warning_Signs_of_a_Virus-Infected_Computer\"><\/span>[CHECK NOW] 10+ Warning Signs of a Virus-Infected Computer<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>There are several signs indicating a computer is infected with a virus that you need to watch for. Below are some common manifestations:<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Computer_Running_Abnormally_Slow\"><\/span>Computer Running Abnormally Slow<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>If your computer suddenly operates much slower than before, this may be a sign of a virus.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Unexpected_Ads_or_Continuous_Pop-Ups\"><\/span>Unexpected Ads or Continuous Pop-Ups<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>If you see many unwanted ads appearing on your screen, it is likely that your computer has been infected with malware.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Programs_Automatically_Launching_or_Closing\"><\/span>Programs Automatically Launching or Closing<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>If applications open or close automatically without your command, this may indicate the presence of a virus.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Files_Missing_Damaged_or_Encrypted\"><\/span>Files Missing, Damaged, or Encrypted<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>If you cannot find some important files or if opening a file shows it is not as it was, you may have been affected by a virus.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Hard_Drive_Continuously_Running_Even_When_Not_in_Use\"><\/span>Hard Drive Continuously Running Even When Not in Use<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>If your hard drive indicator light is continuously on without reason, this may indicate that a virus is operating in the background.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Firewall_or_Antivirus_Software_Automatically_Disabled\"><\/span>Firewall or Antivirus Software Automatically Disabled<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Viruses may attempt to disable security measures to easily attack your computer.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Emails_Sent_Automatically_from_Your_Account\"><\/span>Emails Sent Automatically from Your Account<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>If you see emails sent from your account that you did not send, it may mean your account has been compromised by a virus.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Homepage_of_Browser_Changed\"><\/span>Homepage of Browser Changed<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>A change in the homepage or default search engine can be a sign indicating that you have been infected by a virus.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Unfamiliar_Icons_Appearing_on_the_Screen\"><\/span>Unfamiliar Icons Appearing on the Screen<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Unfamiliar programs continuously appearing on the screen may also be symptoms of a virus, especially if you did not install them.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Computer_Frequently_Freezing_or_Restarting\"><\/span>Computer Frequently Freezing or Restarting<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>A clear sign of a virus infection is when the computer freezes or restarts unexpectedly and frequently.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"DETAIL_Explanation_of_Virus_Warning_Signs_on_Computers\"><\/span>[DETAIL] Explanation of Virus Warning Signs on Computers<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>The signs of a virus can vary greatly and are complex. Below is a technical analysis for each sign:<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Technical_Analysis_of_Each_Sign\"><\/span>Technical Analysis of Each Sign<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Each sign can be the result of various factors within the computer. Therefore, careful analysis is essential to determine the exact cause.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Why_Do_Viruses_Cause_Such_Symptoms\"><\/span>Why Do Viruses Cause Such Symptoms?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Viruses often consume system resources, preventing applications from functioning normally, leading to slow performance or restarts.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"IMPORTANT_Distinguishing_Virus_Symptoms_from_Other_Software_Errors\"><\/span>[IMPORTANT] Distinguishing Virus Symptoms from Other Software Errors<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>When you notice signs of a virus on your computer, you need to accurately identify the cause to avoid confusing it with other software errors.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"When_to_Suspect_a_Virus\"><\/span>When to Suspect a Virus?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>If there are multiple combined signs and no clear reason for the computer&#8217;s abnormal operations, you should suspect a virus.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Steps_to_Check_for_Determining_Causes\"><\/span>Steps to Check for Determining Causes<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>You can check the system activity history, the list of running applications, and use antivirus software to scan the entire system.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"EMERGENCY_What_to_Do_If_Your_Computer_is_Infected_with_a_Virus\"><\/span>[EMERGENCY] What to Do If Your Computer is Infected with a Virus?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Once you confirm that your computer is infected with a virus, you need to act immediately to protect your data.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Disconnect_Internet_Immediately\"><\/span>Disconnect Internet Immediately<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Disconnect the internet to prevent the virus from spreading and protect personal information.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Use_Trusted_Antivirus_Software_to_Scan\"><\/span>Use Trusted Antivirus Software to Scan<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Install good antivirus software and scan the entire system to detect and remove viruses.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Restore_the_System_to_a_Time_Before_the_Infection\"><\/span>Restore the System to a Time Before the Infection<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>If there is a system restore feature, you should revert to a time before the computer was infected.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Reinstall_the_Operating_System_in_the_worst-case_scenario\"><\/span>Reinstall the Operating System (in the worst-case scenario)<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>If all else fails, you may need to reinstall the operating system, but ensure that you have backed up important data.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"PREVENTION_Most_Effective_Ways_to_Protect_Computers_from_Viruses\"><\/span>[PREVENTION] Most Effective Ways to Protect Computers from Viruses<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Prevention is the most effective way to protect your computer from viruses.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Install_and_Update_Antivirus_Software_Regularly\"><\/span>Install and Update Antivirus Software Regularly<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Make sure your antivirus software is always updated to protect against new threats.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Be_Cautious_When_Downloading_Files_from_the_Internet\"><\/span>Be Cautious When Downloading Files from the Internet<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Only download files from trusted sources and check before opening.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Do_Not_Open_Strange_Emails_or_Links\"><\/span>Do Not Open Strange Emails or Links<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Avoid opening emails or links from unclear sources to avoid scams.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Use_a_Firewall\"><\/span>Use a Firewall<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>A firewall helps protect your computer from unwanted access from the network.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Regularly_Back_Up_Data\"><\/span>Regularly Back Up Data<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Periodically back up important data to the cloud or an external hard drive to ensure you do not lose data when infected with a virus.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"SUGGESTIONS_Top_5_Best_Antivirus_Software_Available_Today\"><\/span>[SUGGESTIONS] Top 5 Best Antivirus Software Available Today<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Here are some notable antivirus software options that you should consider:<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Comparing_Features_Advantages_and_Disadvantages\"><\/span>Comparing Features, Advantages, and Disadvantages<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>There are many antivirus software options on the market with varying features and performance. Compare them to find the version that suits your needs best.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Free_vs_Paid_Antivirus_Software_Which_Should_You_Choose\"><\/span>Free vs. Paid Antivirus Software: Which Should You Choose?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Free software may not provide adequate protection against all threats, while paid software often offers more features and better support.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Q_A_Frequently_Asked_Questions_About_Computer_Viruses\"><\/span>[Q&amp;A] Frequently Asked Questions About Computer Viruses<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Many users often have questions regarding computer viruses. Below are some frequently asked questions:<\/p>\n<h3><span class=\"ez-toc-section\" id=\"How_Do_Computer_Viruses_Spread\"><\/span>How Do Computer Viruses Spread?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Viruses can spread through email, downloading files from the internet, installing unknown software, or through networks.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Is_Installing_Antivirus_Software_Always_100_Safe\"><\/span>Is Installing Antivirus Software Always 100% Safe?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>No, nothing is completely safe. However, installing reputable antivirus software helps reduce risks.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Can_a_Mac_Get_Infected_with_a_Virus\"><\/span>Can a Mac Get Infected with a Virus?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Although Macs are less likely to get infected with viruses, they can still be attacked. Therefore, Mac users should also be cautious.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"CONCLUSION_Protecting_Your_Computer_from_Viruses_Investing_in_Safety\"><\/span>[CONCLUSION] Protecting Your Computer from Viruses: Investing in Safety<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Protecting your computer from viruses is not just about installing software, but also about developing smart computer usage habits and prioritizing information security.<\/p>\n<p><span data-sheets-root=\"1\">Explore related services at IT Systems, providing professional and multi-channel technical support<\/span><span data-sheets-root=\"1\"><br \/>\n<a class=\"in-cell-link\" href=\"https:\/\/itsystems.vn\/en\/it-services-for-businesses\/it-support-services\/\" target=\"_blank\" rel=\"noopener\">D\u1ecbch v\u1ee5 IT Support<br \/>\n<\/a><\/span><\/p>\n<p><span style=\"color: blue;\">If you need assistance, please contact us right away<\/span><br \/>\n<b>IT SYSTEMS VIETNAM CO., LTD<\/b><br \/>\n<i>IT Solutions \u2013 Your Business IT Department<\/i><br \/>\nHOTLINE: <b>0283 9950 359<\/b><br \/>\nEmail: <a href=\"mailto:contact@itsystems.com.vn\">contact@itsystems.com.vn <\/a><br \/>\nWebsite: <a href=\"https:\/\/itsystems.vn\/en\/\">https:\/\/itsystems.vn\/<\/a><br \/>\nFacebook: <a href=\"https:\/\/www.facebook.com\/ITSystems.VIETNAM\" target=\"_blank\" rel=\"noopener\">https:\/\/www.facebook.com\/ITSystems.VIETNAM<\/a><br \/>\nYoutube: <a href=\"https:\/\/www.youtube.com\/@ITSYSTEMS\" target=\"_blank\" rel=\"noopener\">https:\/\/www.youtube.com\/@ITSYSTEMS<\/a><\/p>\n<p><b>HCM: <\/b>2nd Floor, 184\/1A Le Van Sy Street, Ward 10, Phu Nhuan District, Ho Chi Minh City, Vietnam<br \/>\n<b>HCM: <\/b>321\/10 Phan Dinh Phung Street, Ward 15, Phu Nhuan District, Ho Chi Minh City, Vietnam.<br \/>\n<b>Hanoi: <\/b>House No. 22, Garden Villa Area, Vinh Hoang Urban Area, 431 Tam Trinh Street, Hoang Mai District, Hanoi, Vietnam.<br \/>\n<b>B\u00ecnh D\u01b0\u01a1ng: <\/b>Binh Duong Boulevard, Phu Hoa Ward, Thu Dau Mot City, Binh Duong Province, Vietnam<br \/>\n<!-- its-deep-aio-en-related-2026-07-27 --><\/p>\n<section class=\"its-deep-aio-related\" aria-label=\"Related IT Systems services\">\n<h2><span class=\"ez-toc-section\" id=\"Related_services_from_IT_Systems\"><\/span>Related services from IT Systems<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>If your team is dealing with this issue in a live business environment, these services can help you move from diagnosis to a stable operating process.<\/p>\n<ul>\n<li><a href=\"https:\/\/itsystems.vn\/en\/microsoft-business-licensing\/microsoft-windows-licensing\/\">Windows licensing for business<\/a><\/li>\n<li><a href=\"https:\/\/itsystems.vn\/en\/microsoft-business-licensing\/windows-license-pricing\/\">Windows license pricing<\/a><\/li>\n<li><a href=\"https:\/\/itsystems.vn\/en\/it-services-for-businesses\/it-support-services\/\">IT support services<\/a><\/li>\n<\/ul>\n<\/section>\n<p><!-- its-deep-aio-en-faq-2026-07-27 --><\/p>\n<section class=\"its-deep-aio-faq\" aria-label=\"Frequently asked questions\">\n<h2><span class=\"ez-toc-section\" id=\"FAQ\"><\/span>FAQ<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<h3><span class=\"ez-toc-section\" id=\"When_should_a_business_ask_IT_Systems_for_support\"><\/span>When should a business ask IT Systems for support?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Ask for support when the issue affects users, business data, security, licensing compliance, service availability or daily operations. A short technical review often prevents repeated incidents and hidden costs.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Can_IT_Systems_help_review_the_current_environment_before_proposing_a_solution\"><\/span>Can IT Systems help review the current environment before proposing a solution?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Yes. IT Systems can review the current setup, identify risks, map the issue to the right service scope and recommend a practical next step for your business.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Does_this_topic_connect_to_ongoing_IT_operations\"><\/span>Does this topic connect to ongoing IT operations?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>In most cases, yes. Problems around software, cloud, endpoint, network, backup or security should be connected to a broader IT operations plan instead of being handled as isolated incidents.<\/p>\n<\/section>\n<p><!-- its-deep-aio-en-cta-2026-07-27 --><\/p>\n<section class=\"its-deep-aio-cta\" aria-label=\"Contact IT Systems\">\n<h2><span class=\"ez-toc-section\" id=\"Need_help_applying_this_to_your_business\"><\/span>Need help applying this to your business?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>IT Systems Vietnam can help assess the issue, recommend the right service path and support implementation for your team.<\/p>\n<p><a class=\"button\" href=\"https:\/\/itsystems.vn\/en\/contact-it-systems-vietnam\/\">Contact IT Systems<\/a> <a class=\"button\" href=\"https:\/\/itsystems.vn\/en\/it-services-for-businesses\/it-support-services\/\">View IT support services<\/a><\/p>\n<\/section>\n","protected":false},"excerpt":{"rendered":"<p>Why Early Detection of Virus-Infected Computers is Important? Early detection of virus-infected computers is crucial for protecting data and system performance. When your computer encounters a virus, not only can performance suffer, but personal data can also be severely damaged. Risk of Data Loss When a computer is infected with a virus, files can be [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":69627,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"rank_math_focus_keyword":"Virus infected computer","rank_math_title":"Virus Infected Computer: 10+ Warning Signs & How to Handle It","rank_math_description":"A virus-infected computer has many identifiable signs. This article helps you detect and address them timely.","rank_math_robots":"","rank_math_canonical_url":"","rank_math_schema":"","footnotes":""},"categories":[2146,1344],"tags":[],"class_list":["post-69634","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-it-knowledge","category-uncategorized-en"],"wpml_current_locale":"en_US","wpml_translations":{"vi_VN":{"locale":"vi_VN","id":69625,"slug":"may-tinh-bi-nhiem-virus-10-dau-hieu-nhan-biet-cach-xu-ly","post_title":"M\u00e1y T\u00ednh B\u1ecb Nhi\u1ec5m Virus: 10+ D\u1ea5u Hi\u1ec7u Nh\u1eadn Bi\u1ebft & C\u00e1ch X\u1eed L\u00fd","href":"https:\/\/itsystems.vn\/may-tinh-bi-nhiem-virus-10-dau-hieu-nhan-biet-cach-xu-ly\/"}},"_links":{"self":[{"href":"https:\/\/itsystems.vn\/en\/wp-json\/wp\/v2\/posts\/69634","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/itsystems.vn\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/itsystems.vn\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/itsystems.vn\/en\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/itsystems.vn\/en\/wp-json\/wp\/v2\/comments?post=69634"}],"version-history":[{"count":2,"href":"https:\/\/itsystems.vn\/en\/wp-json\/wp\/v2\/posts\/69634\/revisions"}],"predecessor-version":[{"id":86197,"href":"https:\/\/itsystems.vn\/en\/wp-json\/wp\/v2\/posts\/69634\/revisions\/86197"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/itsystems.vn\/en\/wp-json\/wp\/v2\/media\/69627"}],"wp:attachment":[{"href":"https:\/\/itsystems.vn\/en\/wp-json\/wp\/v2\/media?parent=69634"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/itsystems.vn\/en\/wp-json\/wp\/v2\/categories?post=69634"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/itsystems.vn\/en\/wp-json\/wp\/v2\/tags?post=69634"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}