Webroots Spy Sweeper is a fantastic product also. Its the only one I found that got rid of 5 of the worst browser hijackers that had infected my kid's pc. I tried every prog on them and only Spy Sweeper was able to detect and then eliminate each one perfectly. I highly recommend this.
You can do a free scan online off this link. And download the software on a 14 day trial. Works great!!
http://www.webroot.com/services/spyaudit_03.htm
And to illustrate how fucked up it is out there, the def file has the fingerprints for over 208,000 of these scum progs. I think its virtually impossible to surf the net and not get this crap in your PC. Spy Sweeper also has a great shield system to deploy once you are cleaned to prevent anything from getting you again.