two solutions:
1)
On windows 7 64b
- Open notepad (or Notepad++)
- Copy/paste (just check the file path, if you don't have 64b edition):
"C:\Program Files (x86)\Steam\SteamApps\common\divinity ii - dragon knight saga\bin\Divinity2.exe" /revoke
- Save as Revoke_steam.bat
- run as Administrator
2)
OR but slower : check file integrity in steam (menu of the game)
Nice day