Since I bought Dawnguard on Steam, Skyrim have started to crash, crash, crash. All the time. But usually I could just restart the game and keep on playing. But now I've come to the door that is supposedly going to the Auriel Bow. To the Inner Sanctum. And everytime I go through that door it crashes without error message and without freezing, it just cuts directly to my desktop. Everytime, without exception. I've tried loading from other saves, unequpping everything i have on me and telling Serana to wait outside, but nothing helps. And since it is nessecary to go through that door to keep on playing, I am now stuck and can't play Dawnguard anymore unless they fix this problem. I haven't encountered anyone else having this problem yet. So what do I do?