Install Driver Sweeper and DOWNLOAD but don't install the new driver from NVIDIA.
Control Panel > Uninstall Programs > Uninstall "NVIDIA PHYSX" and "NVIDIA 3D VISION".
Then reboot your computer, and dependig on what model/build it is, enter Safe Mode (In my computer keep pressing F2).
Go to Device Manager (Start > Search Bar > Device Manager) and click on the little arrow nect to the tab "Display Adaptors". It should list all the graphic card that you currently are using.
Right click on the graphics card and select uninstall. Make sure that the other box/es are UNCHECKED.
Before you reboot again, open Driver Sweeper and select the boxes marked "NVIDIA CHIPSET", "NVIDIA PHYSX" and "NVIDIA DISPLAY". Select "Clean", and when prompted o reboot, select "Yes".
Now once you've rebooted, your computer should recognize the graphics card again.
Reboot the computer once more, and after that you can install the new driver.