If you haven't already, download the 3.23b patch for windows.
link:
http://download.shrapnelgames.com/do...mpatch323b.exe
Save it to your PC. When the download is complete, run the "dompatch323b" executable. Setup will update the game. To confirm that the update was successful, start Dom3 and look in the lower left corner of the screen. You should see "version 3.23b".
Hope that helps.