Alright, so I wanted to play some Nazi Zombies on the original maps on WaW, but when I tried to get on it with Xbox Live, I couldn't play. Everything is grayed so I can't click on them. Apparently, days before my friend played on my Xbox and accidentally joined a game with hackers which allowed them to fly, etc. After a few seconds of the game, my friend was kicked and Xbox Live Nazi Zombies/Multiplayer ceased to work. HOW CAN I FIX THIS?
