Windows Vista Users: If you're having problems running this game under Windows Vista, first make sure that you're using the latest Vista graphics and audio drivers for your hardware, and the latest version of this game (see page 4 for patch details). If you can't solve your problems at all using this guide or the resources throughout, you can post on the Official Ubisoft Forums.
If you're having issues with the game see the Ubisoft Support Centre. Importantly, note the system requirements for this game, as if you do not meet them, you will have a lot of problems. Official Support: If you have a problem with the game, the first place to check is the Readme.txt file found in your \Program Files\Ubisoft\Dark Messiah of Might and Magic directory.