the best:

adaware (http://www.lavasoft.de/)
spybot


alternative:


What is spyware : http://www.spychecker.com/spyware.html

SpyBot-S&D : http://www.webattack.com/download/dlspybot.shtml 

Ad-aware : http://www.webattack.com/download/dladaware.shtml 

CWShredder: http://www.spywareinfo.com/~merijn/cwschronicles.html#cwshredder

HijackThis : http://www.webattack.com/download/dlhijackthis.shtml 

Pest Patrol : http://www.pestpatrol.com/

Trojan Remover :http://www.simplysup.com/

KL-Detector  :http://www.webattack.com/download/dlkldetector.shtml 

X-Cleaner Free  :http://www.webattack.com/download/dlxcleaner.shtml 

SpywareBlaster  :http://www.webattack.com/download/dlspywareblaster.shtml 

SpywareGuard :http://www.webattack.com/download/dlspywareguard.shtml 

SpySites  :http://www.webattack.com/download/dlspysites.shtml 

Keylogger Hunter :http://www.webattack.com/download/dlklhunter.shtml 

Spycop: http://www.spycop.com/

BHODemon : http://www.spywareinfo.com/downloads/bhod/

Browser Hijack Blaster : http://www.wilderssecurity.net/bhblaster.html

Goodbye Spy http://www.topshareware.com/GoodBye-Spy-download-2012.htm


Other spyware removal instructions: http://www.pchell.com/support/click2findnow.shtml