Make sure you have the correct and very latest stable driver installed.
For that it is the
v285.58See here for the latest driver for your video card -
http://www.nvidia.co.uk/Download/index.aspx?lang=en-ukIf you have the latest installed I would uninstall it from the device manager and then run this tool
here to completely remove it and then download and install the driver from Nvidia.
It may just be a glitch with the driver. Let us know how you get on.