I posted this in another thread... see if it works for you.
Download
Driver Sweeper, and then download the nvidia drivers you use and save to your desktop.
1: Browse to "C:\Nvidia", leave window open
2: Open device manager, and browse to your video card
3: Right click and choose "uninstall"
4: Delete driver software if prompted (your screen might flicker and revert resolution, this is normal), DO NOT REBOOT YET
5. Go back to the C:\Nvidia folder you left open, delete everything inside it
6. Reboot
7. Start in safe mode (tap f8 on boot)
8. Run driver sweeper, choose to delete all nvidia display drivers. Press the broom icon, it might seem like it did nothing but don't worry, it ran.
9. Reboot. Windows will install generic VGA drivers, if it installs a nvidia driver you did something wrong, go back and delete everything. Do NOT let windows update install anything for you.
10. Install display drivers that you saved to your desktop. Once finished reboot