How do I know if my computer is infected with a virus or other malware?
Posted by Samuel Turi on 11 May 2011 02:03 PM

How do I know if my computer is infected with a virus or other malware?

See below for examples of abnormal computer behavior to determine whether your computer is infected by a virus or malware. 


These examples are common symptoms of malware, but your computer may exhibit many of these symptoms for legitimate reasons unrelated to malware such as software or hardware incompatibilities or system instability. Click here If you are unsure whether you are infected with malware or you experience any of the symptoms below.

Symptoms of malware affecting currently installed Malwarebytes security software:

  • Your Malwarebytes security product is disabled for no reason and cannot be restarted
  • You receive pop-up alerts from rogue antivirus programs claiming that you are infected with multiple viruses

Symptoms of computer malware that affect the Internet:

  • You may receive the error "Internet Explorer could not display the page" when attempting to access certain websites
  • Your web browser (e.g., Microsoft Internet Explorer, Mozilla Firefox, Google Chrome) freezes, hangs or is unresponsive
  • Your web browser's default homepage is changed
  • Access to is blocked
  • You get redirected to web pages other than the one you intended to go to
  • You receive numerous web-browser popup messages
  • Strange or unexpected toolbars appear at the top of your web browser

Malware symptoms that affect system performance:

  • Your computer runs slower than usual
  • Your computer freezes, hangs or is unresponsive
  • There are new icons on your desktop that you do not recognize
  • Your computer restarts by itself (but not a restart caused by Windows Updates)
  • You see unusual error messages (e.g., messages saying there are missing or corrupt files folders)
  • You are unable to access the Control Panel, Task Manager, Registry Editor or Command Prompt.

Symptoms of malware in email:

  • You receive messages in your mailbox without a sender address or subject
  • People receive spam email from your email address with a third-party email program installed (e.g., Microsoft Outlook, Outlook Express/Windows Mail, Windows Live Mail and Mozilla Thunderbird)
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