Not 100% sure this is the same for you.

Right click on your desktop and choose 'Screen Resolution'. You should see something called 'Advanced Settings' click on that. That will open another window that should have multiple tabs on it. One of those tabs should say GeForce blah blah and under that tab you will see something like "Start NVIDIA Control Panel".

If none of that works...

The NVIDIA control panel may be located under your computer's control panel. I know mine is but I'm running Windows 7.

Hope that helps.