I have been trying to compress all my XBOX 360 ISO FILES, it does not work, do you have any ideas what i could use to compress?
What do you mean by 'Compress'? For storage on your HDD till a later point? You can't modify any of the 360 files if you want to use the game. Part of the Anti-Piracy setup on the 360 checks for changes on the disc, if it finds one, it fails.