Is your Win10 and "in-place" update on top of an old Win8.1? I'm almost afraid to suggest it (I had issues after doing this on my original Win10 install), but you could try the special options boot, and try the "Repair" option Half the time, mine used to find things wrong and "fix" them, and the other half of the time, it'd find things correct and break them, or put things back in that I had taken out... I no longer use Win10, and haven't since the commercial release, so I have no idea if you would "fix" or "break" something...
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