So you haven't actually uninstalled it then reinstalled?
Seeing as it's most likely a problem with the FeralHeart files, you'll definitely need to uninstall the whole program (I do this by getting up the Add/Remove Programs from the Start Menu then finding the program, right clicking and uninstalling, though this may only be the case for Acer computers), then go to your C drive, find the FeralHeart folder and delete that and anything else that might be related to FeralHeart (other than pictures and such).
Then reinstall, but make sure you have nothing FeralHeart-related on your computer before doing so, or else it may not create a new FeralHeart folder for you, which could be the problem.