Just go to your computer.
C:\FeralHeart
Remove that folder and the things in it. once that's done reinstall the game with a working game setup.
Just don't forget to make backups of things you want to keep like maps and presets, but also keep in mind, do not add them back into the game right away if you do keep things. Only do it after you tried the game to see if it works. That way you'd be able to pinpoint if it's one of your things that causes the game to crash.