I too caught a rather nasty trojan which pointed me towards a removal program with a name similar to Spyware Doctor (can't remember it). In the end I had to download Spyware Doctor itself as the only thing which would remove the pesky thing. Various PC publications rate Spyware Doctor 5.0 highly. Confusing - innit.
I currently have it running on the 'homework' PC which was the one which caught the trojan (children!) and have just upgraded my free AVG to 8.0 from 7.5. Seems to work ok.
Cheers
mcdhu