Apparently its only vista that doesn't allow dual drivers. Although I can't speak for xp64, my 9600GSO is yet to do anything, though I haven't given it much attention yet, other than basic PnP approach: driversweeper>reinstall ATI drivers, install old pre-lockout nvidia physX drivers. Testing in Batman AA and haven't yet got PhysX running off the GSO. Gonna give it a go again in the next few days with some focus, heh.