Edwin 's suggestion doesn't work, try Cliff S's idea.
Repair Install Windows 10 with an In-place Upgrade - Windows 10 Forums
You guys know what?
I bet with Windows 10, "Did you try a repair install?",
will be the new IT question,
just like, "Did you try turning you PC off then back on?" used to be
But the 'turn off and on again' will still be the first mantra, Cliff! This will live on forever.