Hello evry1,

                       I have a XPS L501X laptop with Geforce GT 420M Graphics Card ,but in the display window ( do Win+r and then type dxdiag on the run console)

it is showing Intel(R) HD Graphics Card (Core i5). I tried selecting  High-performance NVIDIA processor in Global settings tab under manage 3D settings in Nvidia Control Panel but the display window still didn't change the graphics card. Plz Help.......