First check for IRQ and DMA conflicts. Try to resolve them with the conflict troubleshooter. You may have to boot to safe mode, disable your display adapter in the device mangager and reboot. If windows doesn't autodetect the correct adapter remove the the adapter from device manager and reboot. If windows doesn't correctly identify the adapter, give a more exhaustive description of the errors, the device manager settings, the correct ID of your adapter, any recent changes to your system (new hardware) etc.... Are there any other malfunctioning components? Printer, scanner, sound card? A conflict among devices will often bring more than one of them down.