Saving in a different cell and re-starting the 360 didn't work either. So now what? Do I just start a new game? That would really svck.
Dude. Put your saves on a USB stick or something. You will first need to format the stick, so that your 360 will recognize it.
Put saves on stick. Save in another spot if you are freaked out, and trust me, we've all been there.
Delete FO3 and all DLC.
Reinstall.
Load save.
Waltz onto the carrier.
Let this be a lesson:
I have 15 hard saves per character.
I save before every quest, and before I walk into a dungeon.
I also save every 30 minutes or so out in the wastes.
Always create a new save, never overwriting.
Go back and delete old saves every once in a while.
I keep my first save, just inside the Vault 101 door, so I don't have to do the tutorial again.