"HijackThis" is good but doesn't really identify spyware. It points out all the things in your system that could be spyware. It will pick up things like "Google's Toolbar" for example which is prefectly fine.

You really need to know what you're doing. If you run a scan, I can let you know what looks suss at least.

If you know what you installed, there's probably a howto on how to (hmm...) get rid of it.

And yes, although AdAware is a good start, it certainly doesn't find everything.