help! need a good spyware/Adware Removal tool,preferably free!! :( ?

somehow,i got some tracking cookie crap on my computer!
i dont surf evil sites u know.
i dont know how it got on there,but its there all the time.
the only tool i have that recognizes it is called adaware.it says it deletes it,but the next time i start my pc again.its right back,+ it drains some of my web surfing!

can someone recommend a good tool to get rid of this crap for good???

Adaware SE

Protect Your PC For Free PT 1


Adware Spyware SE


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…