i buy GV-N770OC-2GD and install win 7 64bit and display driver stop to reponding..after 5 sec disply recovered it says (display driver nvidia windows kernel mode driver ,version 320.49 stopped responding and has successfully recovered)
First of all you need to TOTALLY remove all the old drivers. Use this link. http://www.wagnardmobile.com/DDU/
Select the respective company(i.e Nvidia or ATI) drivers to be uninstalled.
Use clean and restart option.
And then install the new drivers after rebooting.