I use Anti-Vir from http://www.free-av.com. It's free as the Url implies.
I don't recommend AVG. What is awesome about it is that it has alot of features and is completely automatic all for free. What I don't like is that I was working on a friend's computer and it was infected with a virus that is specifically made to kill AVG and get in.
I don't recommend AVG. What is awesome about it is that it has alot of features and is completely automatic all for free. What I don't like is that I was working on a friend's computer and it was infected with a virus that is specifically made to kill AVG and get in.