If you're still having problems with Spybot then you may want to try Lavasoft's
ad-aware which also looks for adware and spyware installed on your computer. There are three versions of the program with a free basic one. To download it go to
http://lavasoft.element5.com/software/adaware/. You might have difficulty getting to the site right now since they have just posted on their support board that they are having server trouble.