Keep in mind that you should never mix up the FH+ mod and the actual game and it's folders if you do not know exactly what it is you're doing.
FH+ is a stand alone mod/game for a reason, and keep in mind that if you reinstall the game with a broken installer things like missing images and content can take place, also odd problems can occur if you reinstall the game without actually deleting the old copy of FH first.
Suggestion to you is really remove the whole FH game and it's content from C:\FeralHeart.
Download a new game setup from our downloads page.
Install the game.
Run it.
If the error still occurs it might be something with FH+ interfering or aye.. the graphics settings even?