I got forza 5 yesterday. I popped it in and it said i had a 14 gb update before it started installing. I hit download and it started installing. The download got to 56% and i left to do some things while it installed. I came back later to check the install and it said it was on 8% and ready to start. I figured that the update was installed and that the game was now installing. Or vice versa. So i waited forever for the install to finish and it finally did. I hit A to play it and nothing happened. I took the disc out and put it in again and the message saying it has a 14 gb update popped up again. I hit install and nothing happened. HELP?