[shared via Google Reader from How-To Geek]
Do you regularly open your antivirus program and run scans? Microsoft Security Essentials and other antivirus programs think you need to, warning you that your computer may be at risk if you haven’t done so in a while.
In reality, these manual scans aren’t all they’re cracked up to be. You can generally ignore your antivirus and it will do its job in the background without any help from you, only alerting you when it finds a problem.