Try this.
There's 2 ways you can change this setting.
How to fix it!
Either you start the game, go into the options menu, click the Video tab, and then change the rendering subsystem and restart the game.
Sometimes you aren't able to even enter the game, and all you can hear is the menu music, or it just crashes directly after launch. Those who experience this can enter the feralheart folder located in C:\FeralHeart at standard, find the file called "Ogre.cfg" and open it with wordpad.
This file works just as the ingame options menu, but instead of buttons and sliders, there's text.
What we're interested in is the top row
Set the top row text so it is just like in the picture with the text
Render System=Direct3D9 Rendering Subsystem
Save the file, and close it. Next time you run the game it should boot with the new settings you applied.
Even though this solves the graphical problems for most, there's still some unlucky ferals out there that the problems still remain for, but there's still 1 more thing you can try, and that is to update your graphic card drivers.
A computer is hardware, and with time it gets old just like any other thing in this world. If you had your computer for a while, and never updated the drivers, this might be the cause for FeralHeart not to work correctly. Installing Drivers for your computer is like installing any other program that it might need, though knowing how to do this might be tricky, so check the tutorial on how to Here!
If you already tried this and it's not working, chances are that your computer is getting old and can't handle the game. Installing drivers might help, but you're still running the same hardware. Try the game on another computer instead.
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I did and changed the rendering subsystem, but I'm still crashing. So, maybe is the Driver. I tried to update it, but I just get stuck on the 'Installing' screen on the Intel website.
But, if is the Driver, how the heck can from one day to another give me so many problems? I was playing on FH normaly last night.
Thanks for all the help untill now, though.