While the PC version of Fallout: New Vegas
received a rather hefty update early last week, the Xbox 360 version was still awaiting deployment. This happened over the weekend and was immediately followed by reports of system crashes and corrupted save files, leaving Bethesda no choice but to urge players who hadn't received the update, to decline it when next they fired up the game.
Since then, an update for their corrupt update has been applied to all English versions of the game, so if you did suffer any of the above, it's safe to load and apply the new update. For anyone else, you should be all good to go from scratch.
Let us know in the Comments if you had, or are having, any issues with the update.