First off, I'm surprised Ad-aware and Spybot S&D didn't catch it.
The disclaimer: I'm not a professional or even a compsci major. I'm a first year mechanical engineering student. Treat my advice as such.

Assuming it's malware/spyware, a program that I've used in the past to fix some of my friends computers is Hijack This. It's not an anti-malware/anti-spyware program per se, but I've found it useful (it checks certain registry values for changes). If you run the program it will generate a tagged list with these tags:
Deleting some of the items can cause your computer to end up in worse shape than it sounds like it is in now though , and vice-versa (some items that look to be legit. may be the source of the problem). If you've never used HJT before, I'd suggest erring on the side of not deleting something or asking on a security forum, or seeing if someone (more knowledgeable than me) on CD would look at it.

Barring malware/spyware, Sysinternals.com has a process explorer that shows the hierarchy and application each process is running under. Again, I've used it, but I also have an old computer that I have just for experimenting with and can afford to be a little less delicate. (Mark Russinovich has written quite a few programs that may be useful if you've got the time to sift through the computer in an exhaustive search (filemon and regmon), but my opinion is that his programs were written for dissecting your computer to analyze something rather than for quick fixes. My opinion is that Sysinternals is useful, but you'll probably want to use other methods first.
Hope this helps.