Wow you're starting up a bit of a collection here xD
Not to worry c:
First things first, is the account on your computer an administrator? If not then you'll have to change it to an administrator or swap to an account that is an administrator. Once done so, you should find the modified FH.exe and right-click, in the options one should say 'Run as administrator'. Click that and it /should/ let you run it. ^^