I thought today, I'd list out my favorit anti-virus programs, so here they are in order from best to worst in my mind. Anti-Virus products I'd recommend 1. Microsoft Security Essentials - http://www.microsoft.com/security_essentials/ It's free, light on system resources, and effective. The price is right, and I'd say use this with out a second thought. But for those who want other options keep reading. 2. AVG Free - http://free.avg.com It's free, full featured, but heavier on resources than the Microsoft solution. If you're looking for an alternative to the Microsoft option this is a close 2nd. 3. ClamWin Anti-Virus - http://www.clamwin.com/ If you are looking for an open-source and free option this is the one for you. It's very light on resources, but not as full featured as other options. But if you know what you're doing in general and are looking for just a backup system to check the occasional file with, then this is a good option as well. 4. Avast - http://ww