I just happened upon this program and if you're looking for a program that will find stuff that Ad-aware misses this is a good one.Fast,easy and simple to use.Used in conjunction with Ad-aware you're pretty much covered.

This is my favorite :
http://www.safer-networking.org/en/index.html

Spybot - Search and Destroy
It's free and works pissah!

I seem to do very well fixing everyone's computer using SpyBot S&D and Ad-Aware along with CCleaner.. and all are free.