Where can I get a good spyware removal program that does more than simply scanning for free?

My computer is very slow and I'm looking for a program to remove spyware free which is more than just scan. Most will scan your computer for free that ask for money to remove the spyware and adware.

Download the toolbar with Yahoo .. antispyware It scans your computer and draws spyware

McAfee Internet Security Suite 2008 – 3 User [OLD VERSION] $1.95 Mcafee Internet Security Suite for PC…

Adware Spyware SE $29.95 Adware Spyware SE will scan your PC and detect any spyware, adware, malware, Trojans and any other illegitimate software installed on your machine. Adware can cause endless frustration, with adware popup windows, adware advertisements that won’t go away, and adware software that seems to be everywhere on your system! Adware can also be hiding out in various favorites and bookmarks, ready to take o…