go to C:\Feralheart
Inside of the folder there's a file called ogre.cfg
Open this file with notepad.
On the top row it should say
Render System=(the current rendering mode selected)
Set it to the mode that you do not use. The ones you have to choose from is
"OpenGL Rendering Subsystem"
or
"Direct3D9 Rendering Subsystem" <-- this should be what you should set it to
Once you modified the top row and selected the rendering mode that you didn't used to have, save the changes done to the file, and try to start up the game again.
