This happens when you export maps. I use FH+ to export my maps.
Just copy everything in the FH folder you don't want to lose, move that stuff into a FH folder in your documents (make one called 'fh stuff' or something). Uninstall the game + patch, delete all FH related things (even the shortcuts on your desktop to it), all files and such. Then delete the FHSetup.exe and the patch setup. Then redownload the setups for both the patch and the game (but don't torrent them, you can torrent the game but don't torrent the patch). Reinstall it, add the patch, put all your files back and you should be good to go. If you have FH+, I'd suggest continuing your map on the map maker in fh+ and move the exported files into your fh folders.