I am not sure from your sig if you have an MSI GeForce or not. If you do, you can use the Video Capture form the MSI Website. It is the lastest I know about:
I have not tried the new drivers at home yet. I am just running them at work on a A7N266-E with onboard video. I had no trouble with installing 1.12 nForce or 40.41 Detonators, but I have nothing to test the efficiency of the new drivers with.
Another way to do it, but it works only for games using DirectX (DirectDraw), is to change - in DirectX Diagnostic Tool/More Help - the refresh rate from Default to Override and set the desired value.
Have not tried yet the above program, but I also hope that it works with latest nVidia Drivers.