if it doesn't launch it's most likely because you entered the launch command wrongly.
For the crashing itself, if it used to work it's just to reinstall the game, remove the folder
C:\FeralHeart
Then install the game again using a game setup installer from our downloads page.
If your game never worked, try setting your rendering mode for the game to the option not selected(should be Direct3D9). You do this by opening the ogre.cfg with notpad, it's located in the feralheart directory.
Once it's open, just change the top row where it says OpenGL Rendering subsystem, to Direct3D9 Rendering Subsystem. Might help