How did you "copy" it? If it was from your original store bought Disc, and you used a current "backing up" program, you shouldn't have had a problem. So get a recent copy of Dvd2Xbox or the like from the usual places and try again.
If it was a torrent ISO, you'll probably encounter the problem you're describing, and thusly encounter little to no help. Not that I can claim to be 100% original media, but... this is not discussed in such a place as this.