The very best anti spyware I have used is the beta version of microsoft anti spyware and now its called windows defender..and you can go to the windows update site and put its name in a search on the site and its free, all you have to do is first download the windows validation tool (to prove you have legal copy of windows) and its free! I sure wish I had installed it on mine in time since somone hacked my pc and took over my yahoo Id's and I can't get them back!!! Grrrrrrr.....I hate computers!