Some Windows users reported crashes or problems that were related to the sound-system. This is fixed now. Please uninstall the demo or full-version and install the new version, when you have experienced startup-crashes or were only able to play the game without sound.
Uninstalling the game will no affect your savegames. The new version does not include any other changes, than this fix.
You can get the new Windows demo here and the new full version for Windows here.

Thanks for your help Marc, Simon, and Tony.