Install and run Norton SystemWorks and have it "auto-update" and run stuff FOR YOU in the background..you'll probably never have a virus again. Make sure you set it up to protect your e-mail program(s) as well. It's not hard to do. Just keep your virus definitions fresh, DAILY, and you'll probably never have to worry, unless you're one of those people who opens every mail attachment they get. LOL
Natural Selection of PC users...LOL What a concept...
P.S. Download and run Ad-Aware. It will tell you if you have junk and spyware shit on your PC. And for God's sake's DO NOT run "GATOR" or other shit like "WEATHER BUG." Those are LOADED with cookie monsters and adware....