User blog comment:Timeoin/1.5 Patch For Consoles/@comment-67.142.166.26-20120409003505/@comment-30303790-20120411175058

If you have a save from before you take the quest, but still after clearing out or killiing whatever the enemy is causing the problem, try waiting several days. I know that dungeons will completely resst if enough time has passed, and that might fix your problem.