Hello everybody, so I got halo 4 today just like everybody else, and when I went to play the campaign, the prologue loaded fine, but when I went to the first mission, Dawn, it loaded up to 33% then went back to 0, then back to 33%, the back to zero and it said something like "Players failed to load cogent. A player may be missing downloadable content." I tried to install the game after this and it loads up to 43% then stops. Anyone know what I can do?