Yesterday I upgraded my desktop computer from Hardy to Intrepid (Release Candidate). Everything went fine except for Desktop Effects. After upgrade + reboot, a dialog box popped up asking me if I am interested in using nVidia drivers for my graphics card. I picked the 'nVidia 96' driver and asked it to install and Activate it. It never did so. And now, when I go to Appearance > Visual Effects, it refuses to activate them. I go to Hardware Drivers and it says that no hardware on my computer needs restricted drivers. Visual Effects used to work fine in Hardy.