Well first off the best way to get your NAT open is to call your internet service provider and ask them if you could open a port for you 360,ps3 or a Wii it somtimes does not work if you got a new wireless net work box or you lost power to it.
Um microsoft has a disk replacment program for disks and gears of war is one of them.So go to xbox.com and click on the support tab and you should see it.
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