Originally Posted by CaptNKILL
Though I recommend installing Microsoft Security Essentials since it allows you to scan individual files. It takes up practically no resources (5.5Mb RAM on my system), its free and once you install it it basically just disappears until you have a virus. No ads, no pop-ups, nothing.
Probably a solid suggestion on top of mine... I haven't tried MSE yet but plan to in the future if a need ever arises... I have heard good things about it