Hi Kesav, it sounds like something isn't right with your nVidia graphics drivers.

Laptops can sometimes have special drivers, your best bet is probably to go to your laptop manufacturer's web site and find their drivers or downloads section and download and install the nVidia graphics driver for your machine.

- Michael

Hi Kesav,
Google of "switch laptop Intel video to nvidia optimus" brings up some links which may be helpful (?)

- B