when ever I go onto my xbox I dont have a avatar and then when I try and edit it and then save it, it says error to save and then I cant unlock achievements. I downloaded Trails HD as well and it wont save and I cant get any achievements on that either. When ever i go onto play Modern Warfare 2 I always have to do the brightness and how big I want the screen to be and it says that I haven't completed multiplayer even though I have. Someone please help :/

-Alien 8)