What is your power supply? It's just a curious question. Tell me all of your specs. There are two ways. Reinstall the drivers using this method.
1. Download this program to uninstall the drivers.: http://www.guru3d.com/files-details/display-driver-uninstaller-download.html
2. Install the newest drivers from nvidia website here.: http://www.nvidia.pl/download/driverResults.aspx/122618/pl
If nothing works reinstall the windows. Hope that I helped.