I agreed with channa.
I also recommend CWShredder, which can be downloaded at
http://www.intermute.com/products/cwshredder.html
Another program used by many is Spybot S&D, which can be downloaded at
http://www.download.com/Spybot-Searc...-10122137.html
Use the Immunize function, but NOT the Tea Timer since many users have had problems with it.
The last one is SpywareBlaster, which acts like a firewall. It can be downloaded at
http://www.majorgeeks.com/SpywareBlaster_d2859.html
I like to be extra safe. Different programs catch different infections. They also deal with infections in different ways, especially tracking cookies.