The nvidia graphics driver has started crashing causing BSOD and no matter which one i install old or new it has the same problem. When there is no driver installed it seems fine but obviously video playback and smoothness of the screen when scrolling etc are affected. Have tried new install of operating system both the original vista and now windows 7 but to no avail. I suspect a hardware fault but the display is fine with out the driver just with the limited functionality and when running the dell diagnostic test at boot up the graphics pass. Any ideas as to the cause?