Hey Dudes,
It`s not really unban - you must install MW2 with AIW on a other computer ( a computer wich you don`t banned ) and start is with this computer.
then put the files on your normal computer and then you can play.
I hope it works with youre computer ( it has work for me )
P.S. sry for the bad english - if something incorrct wrote it, then i correct it