Microsoft released a free spyware detection and removal tool for Windows XP/2000 NT.
Its pretty good, better than Adware and Search& Destroy I think.
can dwnld from link at www.microsoft.com, its about 6 megs.
Even a feature to check if your Windows machine is a genuine M$ one and not a stolen one, mine passed, yay
Its a Beta one but doesnt expire till June.