» Mon Dec 12, 2011 4:34 pm
You cannot remove quest items from your inventory, so don't worry about having dropped it. Have you talked to Farengar? Check the "Misc" section of your inventory and see if it is there. Perhaps you talked to Farengar, he took it, and you've already advanced in the main quest. Visit the Western Watchtower outside of Whiterun to find out if this is so. Also, be sure you looted the Draugr Overlord's body, for he had the Dragonstone.
Good luck. Don't start all over again, either - load your last save.