I can't play games (most wanted, sanandreas) in full screen?

I recently bought lenovo g500 (win 8, 4gb ram, intel 4000 hd, 15.6 inch)
what changes shall i make in win 8

Hey i'm geting 2 borders from left and right
I tried compaitability options yet game not working in full screen

Right click it press troubleshoot compatibility click troubleshoot program tick the second option and click next and again tick the second option then click next and then choose the first option wait and close the troubleshooter and launch

Try 8gb ram or 16gb