How to Remove computer adds

Hi,
I recently got a comcast cable for internet. After using it for couple of days suddenly adds have started to pop up. Whenever I open a new I.E window or go back or forward. Google pop up blocker is not effective here.
I heard about using addware so I installed spybot. However it has not made any difference.
Can anyone give any suggestions, links. I have windows Xp with I.E ver 6.

Thanks
nipun

Try adaware, too, then. They work best together. Failing that, use a different browser. I use Opera on Comcast and it's just fine.

Echo cheez. Spybot & Adaware should always be run together. I also recommend Opera or Firefox.