SuperAntiSpyware Free Edition
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Full user review
"Very powerful, but slow going on a full system scan."
I have been using AVG free version for a very long time, until I was slowing down quite a bit, and new something was not right with my system. I found this program on CNET and decided to give it a try, and it found a boatload of spyware, and adware on my system, which AVG did not pick up on, ended up removing everything it found and my system is back to normal.
It runs very slowly is the only cons that I have found with it.
Definately give it a try, you will like it.