I use a program call Ad-aware that might help you:

http://download.com.com/3000-2094-10121984.html?tag=lst-0-1

>Occasionaly I get a window that pops up that tells me how I can buy their software to get rid of pop ups. That's extortion in my opinion, so I don't want to purchase their software nor would I trust them.
>
>I get this even when I don't have IE running, so I suspect this program came with some other software I loaded.
>
>What's good to find find and remove this kind of software? Is there a way to tell what I instaled to get this as well?
>
>Thanks
>Kenny