SUPERAntiSpyware is the best antispyware solution that
you can get for free. It doesn’t provide resident protection, but if
you just scan your computer with it once a week or so you should be
fine.

SUPERAntiSpywareSpyware Terminator is great in every way. It is fast, detects most spyware and includes real time protection that can be turned off. Once threats have been detected, it explains the seriousness of those threats and gives you options to remove them rather than doing everything by itself. You can select which ones you want to remove or if you don’t care, remove all threats easily with a single click.
Spyware TerminatorSpywareBlaster prevents the installation of many so-called spyware,
adware and malware programs by disabling the CLSIDs of popular spyware
ActiveX controls, and also prevents the installation of any of them via
a webpage.
SpywareBlasterSpybot - Search & Destroy is a tested and true veteran of the net annoyance wars, and has a support network of enthusiastic updaters.
Spybot - Search & DestroyAd-Aware Free is another good anti-spyware option.
Ad-Aware Free