» Tue Dec 13, 2011 3:37 pm
On PC, haven't tried the cheats, may do that just to attempt to fix the problem, but in order to do the quest what I did was..... (prepare for an epic story -.-) first kill everyone that gets in your way, second find the room the NPC is in that you want to talk to. NPCs quest mobs you may have noticed don't properly die, instead they drop to their knees then stand up eventually. Then assuming he's attacking you which he probably is, beat everyone else into submission avoid beating down the NPC you want, then drag him to a room by himself someplace away from the other NPCs and beat him down. Then sheathe your weapon and when he stands up again as long as no hostiles are near you (should be in the other room looking for you) he'll go about his quest dialogue as normal.
Just a general explanation of how I was able to quest in the great bugged city of Markarth. Maybe someone else can use this method, goodluck