I HAVE ASUS F5RL WITH WINDOWS SEVEN ULTIMATE AND ASUS K52N WITH SAME OPERATING SISTEM,WHEN I PLAY NEED FOR SPEED ON F5RL IT IS OPEN IN FULL SCREEN MODE BUT WHEN I PLAY ON K52N I HAVE FULL SCREEN BUT I HAVE BLACK BACKGROUND ON EACH SIDE ON WINDOW,F5RL IS IN 1200X800 AND K52N IS IN 1366X768,WHAT...