When launching 3D Vision Photo Viewer I get this error:
NVIDIA 3D Vision features not enabled. Please review stereo setup information.
Press OK to launch NVIDIA Control Panel.
To fix this and enable 3D Vision Features, press OK, the put a tick in the Enable stereoscopic 3D box and run the Setup Wizard using the button below. These settings are found in the NVIDIA Control Panel under Stereoscopic 3D -> Set up stereoscopic 3D.
Your hardware must support the 3D Vision Features to enable them. In other words, you need a 3D monitor.