The best anti-virus I've come across is Nod32. Look around (if you know where) for the latest version. It's a really good a/v, just sometimes it gets annoying when it gets outdated and you're too lazy to update virus db lol! And don't use AVG, I don't care how widely it's used. When it comes to my computers security I don't use freeware. I didn't even like the registered version of AVG. Trust me..I've been through alot of a/v's and Nod32 is by far the best I've used.