i am having trouble playing my backed up copies of kotor and kotor too. in kotor the part after you kill the enemy fighters right after you find out your revan when carth speaks his line it just stalls. carth stands there and looks around the room until i turn off the xbox. i have the igr turned off, but it doesnt help. if i play it on my purchased copy it gets through the dialog scene but doesn't load the next, but doesn't load whatever comes after. this really sucks cuz ive never played it before now and think it is the best game i ever played and I WANT TO SEE WHAT HAPPENS

kotor 2 does something similar.
Both these games are extremely buggy and it's unfortunate because these are two very very good games. I suggest that you copy the game to your harddrive using the DVD2Xbox application. Once you've done this, download and install the patches found on pcgamemods.com. There's a tutorial on how to run pc mods for the xbox. Refer to those and let us know what happens.