1. Installing your game to the harddrive.
2. Getting a new copy of the game.
3. getting a new xbox ( yours might be old and cant handle the game unless its alrdy been into microsofts hands for repair (they normaly change the 360s main card and insert a newer better one, so you wont get the rrod again)
4. Getting a bigger harddrive.
5. buy a PS3 and prototype (jk)
6. try checking your disk, it might be scratched when made or sumthin (this goes back to nr.2)