Downloaded Xbox originals wont play on my Xbox 360.

[misteromar mk4]

I downloaded Sid Meirs Pirates for the xbox but when I go to play it, it says "cannot play, download again". I thought ok it must of got corrupted during download. So I delete it and download it again but the same thing happens. I have tried this a total of 5 times now and still the problem persist. Surely it cannot be a bad download 5 times in a row.

 

I emailed xbox support nut they told me to do the same thing agian.



Its not the HD because I can play xbox 360 games off it and demos work etc.



It was originally a arcade model but I have a 120gb HD on it now, so it should be able to play xbox games now.



Any one else have similar problem or know what I can do to fix it?