During the first mission to investigate what the vampires are up to, I always CTD during a certain part. When you enter the room with the alchemy table, there is a stairs to a level below. I go down the stairs and a fight happening between draugr and what im assuming to be vampires, but then the whole thing crashes to desktop every time.

I read on other sites that if I do another quest then come back, it should fix itself. I did another quest and then came back and it still CTDs. Solutions?