Okay, uninstall FH completely. Delete the old FH folder from your C: Local Disk.
Yes even the maps since they have been changed. Maybe save the presets you made/have and that's it.
Once you have deleted everything of the old FH come back to the site and install the game again. (It's the newest version, v1.09) Once you have successfully installed the game download the patch.
If your still having problems just say so and I'll try and see what the problem is.