Rusty, I would like to add that you should always save your game in several different slots...like one when you first get the quest, one (or two) during the quest, and again when you get credit for it...this can save you alot of time and heartache having to go back and redo some things when the game has trouble being aware of what you have done or if you missed something and want to go back and redo it! These things won't happen often, but they do happen and reloading a game from ten minutes prior is always easier than having to go back hours or even days!
Best of Luck to you! Hope you are enjoying the game!
Moni