All newer laptops with dedicated graphics cards also use the embedded video on the CPUs...they default to the embedded video as it saves on power and preserves battery life.
For every game you load, you have to go into the Nvidia control panel and select which GPU you want to use to run the game.
PIA, but once you know how to do it it is a piece of cake.
Skuzzy posted an excellent link which walks you through it (With pictures so must be for pilots!)...
Good Luck!