I recommend the two following free Anti-Spyware programs:
Go the following link and click Continue and then click No, don't validate Windows at this time but continue to download and then click the Download button.
Spy-Bot Search and Destroy
Go to the following link and scroll down to the SpyBot - Search and Destroy 1.3 file and choose which server to download it from.
If you have any problems with either just e-mail email@example.com and I'll help you out.
P.S - Make sure that when they are installed you download the latest Spyware definitions for the program