>I do not have this set and have Win10 Pro and VFP works fine. It should write to 'shadow' copy of the registry or protected file folders.

I don't have it set either and it works fine.

When I have seen this issue crop up, it has to do with the rights the user has on the machine, and switching to Run as Administrator has fixed it, but I think fundamentally it has to do with the account and whatever Group Policy or settings there are on the account.