Install / Updating / Upgrading NVIDIA drivers
Reboot your PC. At the login screen, do not login to any account, press Crt-Alt-F1 Login with your user account […]
Mint 17.2 Guide – Install Nvidia Drivers using PPA
  Update drivers using PPA http://www.howopensource.com/2012/10/install-nvidia-geforce-driver-in-ubuntu-12-10-12-04-using-ppa/ Â