Everytime I enter the Jefferson Memorial to complete Project Purity the game freezes. I cannot finish the game because of this. I do not know what to do. Does anyone have a fix for this problem. I have tried many things but nothing works and I am getting very angry. (yes I have the new patch, yes I have tried older save points and no the game does not freeze anywhere else.) I just want to beat the game and move on to the DLC that I've already purchased..! ! !

I'm afraid your screwed as this is a known bug with no cure and there is unlikely to ever be one since Bethesda seems to have given up on supporting all versions of FO3 !

Hope it wont do this with me, after I finish Mothership Zeta.
After I finish that DLC, I will go on the project Purity place.

You can try deleting the game-data utility and then re-downloading the patch and then re-installing the game.

And I didn't got bugged at Project Purity! ...Wait got one freeze...but nothing to bad. ... The only glitch I had in that mission was the that went thrue the door. I got his sweet trenchcoat and gun (does 11dmg, and is a handgun like the second gun we get in the game...but slightly different)!