Hey guys, so i bought halo 2 for xbox a while back, and put it in my Xbox 360 slim to play it. It came up with an error message, so i did some research and found out I needed a hard drive. So i go and order a hard drive, 250 gigs, put it in, and nothing. It sitll comes up with and error message saying "The game couldn't start. Try downloading the game again." It's a disk, so i never downloaded anything. I know there is nothing wrong with the disk, and I dont have any other original xbox games to test. Can ANYBODY help me? Please?