I have a problem with Dark Messiah. It's a steam version and my computer is has vista. whenever i start the game, the Dark Messiah is starting up message appears. Then the cancel button shades out so I cant press it and it stops loading. Then after small while, it disappears and another message saying MM has stopped working. It's always the same thing whenever I start it up, and I've already tried plugging it out and plugging it in, and nothing happens. I waited a day and nothing happens. I also have the CD but it doesn't work anymore.
Please help.

same here. just spinning blue ring on launch

Same problem here. Installs fine but doesn't start. there comes up an error message and it crashes.

hi, i had the same problem as well but i did a bit of research and found a site which has this explaination for it.

Steam installation issues

"It sometime happens that you get an error while the loading bar gets to 75%, stating there is a problem with the mm.exe file. The program then terminates execution. Go to System Properties -> Advanced Tab -> Performance -> Settings -> Data Execution Prevention -> Select Turn on DEP for All programs. Click the Add button and browse to your Dark Messiah of Might and Magic directory and select MM.exe."

i got it from:
http://news.softpedia.com/news...shooting-39154.shtml

and it works even though it downloaded the game fully. (my game downloaded fully and this method still worked).

Once you follow the steps above it should work.
Enjoy!