I've this peculiar problem - All video playback and even mediaplayer visualization is jerky after installation of nvidia FX 5200 (using latest forceware driver). But it is smooth as long as I keep my mouse moving (using microsoft usb intellimouse!!!! Also, it does not happen if I use ATI 9000!! I've tried drivercleaner after uninstalls and resintalled the card and driver again but it still is a problem. I'm hoping that mouse movement and it relation to smooth video will point to the casue. Thanks.