Have you tried using Display Driver Uninstaller ? This is something I do every time I update the driver. Run the program, tell it to start in safe mode, run the program again, tell it to uninstall the driver. Reboot. Install new driver package, run DDU again to re-enable automatic driver install (because you need it for other devices) and done. Works like a champ and always fixes any odd driver behaviors.
Link to DDU: http://www.guru3d.com/files-details/display-driver-uninstall...