AVG Anti-rootkit and Windows Vista. Not working?

Been using AVGs anti-virus software now and decided to give the anti-rootkit tool a shot. Installed, rebooted, ran it, disc activity, then nothing. Thought it might be the display option choice so I uninstalled it, rebooted, ran the install again and chose the basic interface. The install errored with "cannot create service" but the icon and start menu items did appear. Rebooted again and still when running it nothing happens other than some disc activity.