I accidentally modified your post above instead of replying oops, apologies.
Hm alright. Go in and uninstall FH again.
Make sure to uninstall it using this in the FH folder:
Next, go here:
Click meAnd also get the executable file:
Click meThese two files are mine that I downloaded when I installed the game.
Install it, replace the executable file with the original one, and see if that works.
Sometimes the downloads can be missing files.