With my Latitude E6520 with Intel HD Graphics 3000, NVIDIA NVS 4200M, and Windows 7 Enterprise, I can use the NVIDIA Control Panel to force a specific processor per-application or globally. Try either:
- Right clicking on the Desktop and selecting NVIDIA Control Panel
- Navigating to the Control Panel and searching for NVIDIA Control Panel
If you don't have it installed, make sure you have the latest NVIDIA drivers.
Under the NVIDIA Control Panel, navigate to 3D Settings -> Manage 3D Settings. Select the Global Settings tab and use the Preferred graphics processor drop-down to select High-performance NVIDIA processor. Then hit the Apply button. You may need to restart your computer.