Recently I discovered that the combination of xoftspy, spybot, spywareblaster and webroot's spysweeper effectivly cleared out any and all of the hidden 'bugs' in my system. I also use BHO demon 2, which lets me know if there are any hidden browser helpers trying to install. Along with zone alarm security suite and firefox, I haven't had a single problem. Xoftspy even got rid of the bugs that were wrapped around some of my core files without destroying the file itself!