I just installed a 320 gig hard drive & can't play original xbox games. I've reinstalled the updates from xbox live. I've cleared the cache. The orig xbox games I've tried are compatable with my 360s. The disks are in new condition. When the disks load, the screen says to download them again. I've installed & played xbox 360 games on the hard drive so I know that's working. Is there something else I should be doing?