[KB2563] How do I know if my computer is infected with a virus or other malware?
Issue
Determining if your computer is infected by a virus or malware
Symptoms may not be malware-related
The examples listed below 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.
Solution
Symptoms of malware affecting currently installed ESET products:
Your ESET product is disabled for no reason and cannot be restarted
A threat is discovered or the red ESET Threat Detected window keeps appearing
You receive frequent alerts from your ESET Personal firewall about an unknown program
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 (for example, Microsoft Internet Explorer, Mozilla Firefox, Google Chrome) freezes, hangs or is unresponsive
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 (for example, Microsoft Outlook, Outlook Express/Windows Mail, Windows Live Mail and Mozilla Thunderbird)