xbox 360 Problem - stuck in Arcade mode/No Online

[twtw001]

Anyone know how to get it out of Arcade mode? I simply have no other options, can't access Realistic or Sim. I can change other options like limited ammo, etc., but absolutely nothing happens when trying to change out of Arcade. So, as a result, I also can't play online because most everyone else is on Realistic... I get a "server not available' message. I've been able to connect a couple times but it sucks. And I can play MOH and any other game I want online, never had a problem.

This is driving me crazy...
Thanks...