Try doing a complete reinstall of the game.
Also remember to delete your Crusader Kings 2 folder at "My documents\Paradox Interactive\Crusader Kings 2" (remember to save your files somewhere else first if you want to keep them!).
Also remember to delete your Crusader Kings 2 folder at "My documents\Paradox Interactive\Crusader Kings 2" (remember to save your files somewhere else first if you want to keep them!).