Phil,
The information in #6 was a bit outdated. The correct registry path is HKEY_LOCAL_MACHINE\SYSTEM\Remote Utilities\ . I have now also fixed/modified that old post.
First, try to simply remove that registry key, restart the PC and see if the Host works. If not, then you may try the same but with re-installing. Needless to say you must be an administrator on your PC when doing installation.