I THINK SOMEONE HACKED MY SYSTEM,I CAN PLAY EVERY OTHER GAME,BUT CALL OF DUTY ON LINE.
You can not be hacked on Xbox Live. Certain Call of Duty titles have been modded, but even this isn't hacking and they can not do anything to your Live account.
Now for us to help you, you need to tell us what the problem is.
Can you get into games?
Do you get kicked from lobbies?
What is your NAT status?
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It sounds like you mat have been banned fromthe CoD game. Was it a Treyarch game? (Waw, Black Ops.) or Infinityward(MW1, MW2)?