If the game was running correctly the last time you played and is now crashing whenever you try to start the game, your game profile may have become corrupted.
You may be able to get the game to launch correctly again by deleting your profile information. This does not effect your save game data.
1. Navigate to:
2. Select the folder Might & Magic Heroes VI
3. Left-click and press Delete
3. Start the game
Your profile information will be recreated when you start the game. If this information was corrupted, then the game should launch correctly now.