Hi Sherry,
A restore didn't do it nor did rolling back the OS to a previous build of 10 (when all was well), thought one of these would have been my savior but no such luck. Tried so many things such as suggested here and elsewhere (list is a mile long) yet we keep
ending up with the same results, the app store along w/several apps fail to open, the one error being the most prevalent is "ms-windows-store"PurgeCaches"... "The app didn't start"... No updates applied have been the saving grace either which isn't a surprise.
So as you mentioned, I think were at our "last resort" and being that this isn't the only PC looking to get a complete overhaul (unrelated problems but same end result), can say that MS and W10 are not on my "nice" list this year especially now that Xmas
is just around the corner.