Did you get the game to work? Unfortunately your posts are not really clear on that.
You can also try verifying the integrity of the game cache, and if that does not help a clean install.
* Go to your Steam games library
* Right click on "Crusader Kings II" and select "properties"
* Click on the tab "Local Files"
* Now click on "Verify integrity of game cache"
* Wait until this process is finished, if any files are missing/corrupted it will notify you at the end of the process and automatically start with re-downloading these files
Clean install:
Important: Go to '..\Documents\Paradox Interactive\Crusader Kings II\save games\' and copy all the save games you want to keep outside the folder
* Uninstall Crusader Kings II
Steam users:[/B] uninstall the game from within steam by right clicking on the game and select "Delete content"
* Go to the folder where you installed Crusader Kings II in, and check if the Crusader Kings II folder is removed. If not, delete the entire folder
Steam users:[/B] Installation folder can be found at: '..\Steam\SteamApps\common\'
* Go to '..\My Documents\Paradox Interactive\' and remove the entire Crusader Kings II folder
* Install the game, make sure you install the game outside the 'C:\Program Files\' or 'C:\Program Files (x86)\' folders, as it can cause issues with permissions