The problem is that I never got the letter from the King of Worms that starts the Lich's Soul quest. See, way back when I had just started the main quest, I delivered Morgiah's letter to the King of Worms, but then when I went to the court of Wayrest to give Morgiah the letter that the King of Worms gave me, she wouldn't acknowledge me at all. I couldn't talk to her, and she wouldn't take the letter I was supposed to give her. Come to think of, I think that the letter may have disappeared from my inventory at some point, because I don't think it's in my inventory now, unless it's on my wagon. Actually, I'm pretty sure that I didn't have a wagon at that point, so that's unlikely.
Have I pretty much broken the main quest, or is there some way to fix this? Like maybe some nifty program that resets a subplot of the main quest or really just anything that would allow me to continue the story.
Also, after killing Lord Woodborne my log still says that Lysandus' ghost told me who killed him, and when I picked up Lord Woodborne's diary after killing him, the log updates to tell me that I could use this against him (although he is already dead) and indeed, I can go to Nulfaga, Barenziah, or Eadwyre and they tell me that that they'll take care of Woodborne (although, again, I've already taken care of him), but my log still has the entry about Lysandus' ghost and Woodborne's diary. Shouldn't those entries have disappeared when I killed Woodborne? Is this a problem as well?
Thanks in advance.