just a note here, I've found, after a LOT of frustration, that spybot/adaware etc, really do suck.
They pick up some stuff, but miss others - just too inconsistant.
I run
http://webroot.com/products/spysweeper/ and it's great.
Nothing gets through, the cleans are fast and effective, the database is always up to date, and it makes sure things like your bookmarks etc don't get touched.
Instead of running 5 programs that try to cover different areas, run this, and have it cover them all, properly