Now I've went and done it...... I unistalled the driver via the Device Manager, then I went to the Control Panel Progams Options (Add/Remove Programs) and uninstalled the ATI Uninstaller, choosing Express Unistall all ATI Software. During the unistall Windows flashed a Blue Screen with an Error message but it was gone so quickly I didn't get to see the text. Now I get the startup screen and the system boot sound but that's it, all I get is a black screen. Like a dummy I didn't bother to make an emergency startup disk.