I had a Trojan Installer which was turning off my Norton Auto Protect. I downloaded it myself in a game patch and should have known better so I had no one to blame but me.
Point is, I could not get rid of it and had to restore the Ghost copy of my hard drive.
That was the bad news. The good news is that there is nothing like a nice, clean, re-formated system. Fast and clean again. I have been Ghosting every week since and I think I am going to re-format the system every 6 months from now on!
Anyway, when you get rid of it I would get Ad-Aware, Spybot, and SpySweeper in addition to your anti-virus program.
Good Hunting... from Varmint Al