From what I can tell, Windows Defender is a free program included with Windows Vista that provides spyware protection (but no anti-virus services). How does it stack up against other free anti-spyware programs like Ad-Aware? If you recommend Ad-Aware over Defender, can you outline a plan for disabling/uninstalling Defender so that I can get Ad-Aware up and running? (I've had bad experiences with trying to remove pre-installed Microsoft products (e.g., IE4)!)