Best Antispyware Program

I want to know what is the best anti spyware program out there. That can protect me and detect spyware and doesn’t slow down my computer. A couple programs I used were etheir very slow or didn’t detect anything.
Answer #1
Spybot S&D
Answer #2
we have, literaly, about 5 posts a week asking EXACTLY the same question. search first.
http://www.google.com?t=2603967&highlight=
http://www.google.com?t=2706712&highlight=
http://www.google.com?t=2480203&highlight=
http://www.google.com?t=2212663&highlight=
Answer #3
SpySweeper from webroot