Well i was in the Cave in Camp Guardian i found the radio message about someone needed help so i found him we were going to leave and when we left the cave the game froze while it was saving i thought that was it but it didn't go back to normal so i turned off the Xbox 360 and i tried loading that saved game and it says the DLC is not here.. you need to download it again so you can load it"continue loading"? if you pick yes some things will be changed i picked yes and it says sorry the Memory storage is unreadable please try again...I noticed alot of Glitches i mean alot but nothing like this

The weird thing about this is that it says DLC that i was playing some kind of Downloadable Content...I don't have Xbox Live so i couldn't have Downloaded anything...
I have not played New Vegas ever since and it is about a month now without playing it.
Is this a fixable glitch or this happened because the game froze when the game was automatically saving?