If you delete your GamerProfile.XML file, it resets all your settings to default...even the Display settings.
Mine is in: Documents>MyGames>Watch_Dogs>user-id*>GamerProfile.XML
When you start the game it creates a new default GamerProfile.XML
* - my user id is a bunch of numbers/letters and yours will be different than mine
Not trying to bring up and old thread, but I found this through a Google search and figured that people could benefit from this info. Especially since it was unsolved.