Joseph - it looks like there might be some kind of permissions problem (or possibly a corrupt registry?)
Open the key file in notepad, and you will see the registry path and value that needs to be inserted - open Regedit and try to enter these values manually and see if that works. If it’s some kind of permission problem, try logging on as an administrator.
Two possibilities here I think - 1. make sure the user you are logged in as has read permission to that registry key, and 2. If it’s a 64bit system then you have to put it under the Wow64 registry path too.