That is strange. Activating the bundle key shouldn't have done anything to the game.
Try starting the game directly from the Divinity2.exe or Divinity2-debug.exe executable files, in the '..\divinity2_dev_cut\bin' install folder?
Try setting the game to run in a window. Edit the graphicsoptions.xml file in Notepad (or other text editor) and in the term
fullscreen="1" change the one to a zero and save.
You can also check the resolution (ScreenWidth and ScreenHeight terms) to make sure they are set properly, and adjust if required.
In XP the graphicsoptions.xml file is in the folder
C:\Documents and Settings\ %username% \Local Settings\Application Data\Divinity 2\Profile
or in Vista / Win 7
C:\Users\ %username% \AppData\Local\Divinity 2\Profile
You may need to set Windows Explorer to show hidden files and folders (
XP, Vista,
Win 7).
If that doesn't help, check out the suggestions and links in the Steam discussion:
Game won't start, I need help desperately
