How do you tell if your computer has a virus

How do you tell if your Windows computer has a virus and infected? Seriously! You have anĀ antivirus software installed, and you go about using the computer with the feeling that it is well-protected and hence malware-free. But maybe, just maybe, there could be malware or a Trojan or a key logger operating on your computer without your knowledge and compromising your security or damaging your data.

How do you tell if your computer has a virus

How do you tell if your computer has a virus

Is your Windows computer infected? Learn to recognize malware infections and signs, symptoms that will tell you if your Windows PC has a computer virus. In this post, we will see some of the symptoms of malware infection, that will tell you if your computer was compromised or infected with computer virus.

Read: How can you get a computer virus or malware.

Symptoms of Malware Infection

The typical symptoms that your computer may have been compromised are:

  1. Change in your browsers home page or default search
  2. Your web browser hangs or becomes sluggish
  3. Your computer starts behaving sluggishly or hangs often
  4. You are unable to open security-related sites or domains.
  5. You get re-directed to web pages you did not intend to visit
  6. Unexpected toolbars in your browser
  7. Security software or Firewall disabled
  8. Your security software throws up warnings, or its icon turns red or something.
  9. Pop-ups while browsing, unknown or excessive
  10. Balloon Notifications from your system tray
  11. Excessive CPU or Memory utilization
  12. Internet or data transfer activity – Modem appears to be working overtime
  13. You start seeing unexpected Windows error messages
  14. Some programs start automatically
  15. Some important Windows functions or features disabled. Eg, Task Manager, Registry Editor, Control Panel, Command Prompt, etc.
  16. New unknown, unwanted software installed, etc.
  17. You see new icons on your desktop suddenly.

If you see any of these signs if is quite possible that your computer may have become infected with a virus or malware.

Starting with Windows Vista, Microsoft introduced many security features in the operating system which were further improved upon in Windows 7, Windows 8.1 and Windows 10. Nevertheless, should your computer get infected with malware, there are ways to remove malware infections.

Read next: How do I know if my Computer has been Hacked.

Posted by on , in Category Security with Tags
Anand Khanse is the Admin of, a 10-year Microsoft MVP Awardee in Windows (2006-16) & a Windows Insider MVP. Please read the entire post & the comments first, create a System Restore Point before making any changes to your system & be careful about any 3rd-party offers while installing freeware.


  1. BEER4Spam

    This should be common knowledge for every PC User !

  2. Joe Bloggs

    There’s always one smart arse! For many people, the advi e will be well received. Thank you!


  3. Lojix Net

    The more this although this should be “common knowledge” for PC users, unfortunately it is not. So spreading this kind of information is sure a step in the right direction to making all PC users aware of the common signs and prevalence of malware among computers connected to the internet.

  4. weebit

    I have to add; “Your computer takes on a mind of it’s own.” Now a few will say that this relates to a few tips above, but the public understands this statement, and in many instances relate to this more than anything else posted above. Mention this to a computer user and they can tell you yes or no if their computer relates to it.

  5. Terry Jones

    So how come I can’t clean my PC with this free application. All I get at the register link is the option to use PayPal or my plastic. Still, as it said, the DOWNLOAD AND WASTED TIME WERE FREE…

  6. YoDudes

    8. Your security software throws up warnings or its icon turns red or something.
    Yeah. Something.

  7. Bubba

    Because this site like many others tell you about the problem and offer to diagnose not fix it for free. (I like this site for information, but they seem to be only wanting to sell something)

  8. Alex

    My vaio win 7 laptop did not accept my password so I restarted it, screen went black, message pops up then disappears before I can read it, now it will not turn off but the monitor is black, wtf is going on?

  9. Boot into Safe Mode and restore your computer back.

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