If you clicked o Microsoft "Anti-Virus 2009" it's already too late. You're infested with spam that refuses to be deleted and if you attempt to access the removal tool it won't download. I tried just about every way I could to delete it. It resisted everything I tried. Pop-ups eveery time I turned around.
The only way Microsoft would stop the pop-ups and spam would be if I paid big $ for their application. Since I didn't need this I figured a simple "NO" would be enough. File shredder, program delete, cancel, none would get this out of my system. It just hung on like a bad cold.
I finally gave up and restored my system back before Anti-Virus 2009.
If you see it do not download it! It is not a download! If you've downloaded it good luck on removing it . I tried for a hour before I just gave up and restored my system. Good luck, Tom