So ive had Fallout 3 for a long time now, Finished it a few times and was happily enjoying myself with the downloadable content.

Knowing full well Ive had to have the final mission still, to continue into broken steel. Which I have bought from the market place.

But that is also were my problems lies. Having installed Everything but Mothership Zeta, I wanted to do the broken steel part first, before i go to point look out.
However, in the final mission, where you have to follow liberty prime to the purifier it keeps locking up.

Its completely random, but mostly within 5 minutes. I never had this constant locking up problem before in fallout 3.
Sure I had a few random lock ups over time, but never this quick and this often.
It also seems to be a problem with just fallout 3 and only after I installed Point lookout and Broken steel.

Things I have tried so far,

- Clearing hard Drive Cache. [ still locks up ]

- deleting most of my saved games and doing a Cache clear. [ still locks up]

- Deleting Broken Steel + Cache clear [ Still locks up]

- Deleting Point Lookout + Cache clear [ still locks up]

Im baffled here =/ Ive tried everything I could have thought off.

I simply cannot continue my game anymore. Any ideas?

p.s. I dont have any saves anymore, other then my autosave and a inmission save from take it back.

Well, Ive come to the conclusion this is a glitch in the game and save.
Having it tried on a different xbox and having the same symptoms.

Its save to say, since i dont have any saves left from before this mission, then Im fubarred and have to restart the game from scratch

Unless Bethesda decides to fix this