This might be hard to hear, but you might need to uninstall the game via the uninst application in the Last Moon folder (find where you downloaded it), and re-install it. If you need screenshots, I can show you when my game re-installs. This also fixes the Ogre Exception with the Quest.dat
Can you please tell me everything you've tried already? I'll see if I can possibly transfer the mesh file over to you... Maybe uninstall and re-install Ogre?
EDIT: Try searcing for rosecrystal in your "My PC" or "This PC"