cause your not suppose to **** install it when you put the regular disk on the tray let it read and when it shows the picture take off magnet quickly then take your iso disc and put magnet back on and the picture will still be there but you half to be quick about it and click a on it and itll take a minute to read it when you start it because you changed something in the game so do that and if your iso disc wont work when you start it you didnt finnish making it or something so their ya go bro if you want to talk in person on live and do it when your xbox is tookin apart send a party invite to xXPRoxGamerXx21

have you got a usb or flashdrive any size?
if you have configure it to your xbox and when its pluged in press install on your regular disc and a message will pop up saying select memory device when it does leave it there and you have as much time as you like to hotswap, when your modded disc is in select your where you want to save it (your harddrive?) and it will install.
Your disc wont spin again untill it starts installing so don't worry that its stopped.

hey guys thanks for the feedback and i mean it because i see alot of gta iv modded iso topics on here were people need help and they dont get so thank you. i will try both out later today.