Try checking the Feralheart folder>media>particles for duplicates ending in _02 and stuff like that. Delete those, otherwise, if you don't find them, then you might want to change your Rendering system on the outside. If you don't know how, just tell me. Another way could be to right click and click "Run as administer" to run the game. If nothing works at all, then I'm not sure; it could be a problem with your computer itself, unless restarting will just work.
EDIT: PFFT. Alphabutt, you got here first. x'D