Here's a good fourm to go to... 

http://computercops.biz/forums.html

they have links to downloads and reviews of 
programs and tutorials and whatnot

I recommend using hijack-this but be VERY 
careful as it is easy to delete important stuff. 
Be sure to follow the guide closly.
http://computercops.biz/postt6393.html&sid=67b717
d6ccb08dc2bc7286db831fda11

Also, try the PeperFix and CWShredder to get rid 
of certain annoying files. (these scan for and 
delete them)

hope this helps!
~dude_moose