Changed the MAC address, although the same number XUID
well try again
If you are trying to get unbanned it wont work, NT made it so that changing the XUID wont work...
Changing your XUID is nearly impossible unless your re-install your Operation System.
/Marked as Solved
Go in c:dows and delete winsxs folder, then restart the windows, run the game, type in the console "com_id and your xuid" and keep pressed CTRL + Q until runing mw2.
Work for me