Every time I go near Windhelm my game freezes and I can't to my house because of it. I presume it's because of Dawnguard since this never happened to be before I got the add-on. Does anyone else have this problem or know how to fix it?

Anyone?

Does it lag before it freezes? Try using the wait button or sleeping for several in game days to see if something in or around Windhelm is spawned wrongly.

I'm fine with Windhelm but I have found that I'm unable to go into the old Dark Brotherhood Sanctuary on one of my characters (the other one is fine), I just get a black screen when I'm done loading.

No, but it was lagging when I was playing as a werewolf then it froze. All I had to do to fix that is stand still to wait for the lag to stop. I'll try that waiting thing, though. Hopefully it'll work then.

People aren't replying because they don't know about it, buddy.

So it's not something to do with something spawning wrongly or any glitched items in my inventory. Anyone got any other ideas?