start>control panel>performance information and tools>adjust visual effects
are you saying you had it it working in vista and it's now stopped or that it worked in xp, how do i get vista to do it?
have you changed anything recently? hardware or drivers specifically
bump
Should be somewhere in Peformance Options Adjust Visual Effects.
Directory: Control Panel\System and Maintenance\Performance Information and Tools
Left-hand Side: Adjust Visual Effects