Hey really need a help here!
 

I download my Force Unleashed 2 yesterday and it's really good!
but then shxt happens.After 2 hours playin' I now cannot use the Force Grip!
But all the others buttons are working except the Force grip button.When I USE ALT+TAB and escape to the desktop and re-enter it the grip was working again but only working for 1 or 2 minutes .

Please I really need help!!