I have found a fix that won't work for the average user - only sysadmins with access to a Windows 10 ISO.
Here's what I did:
- Downloaded the Windows 10 Pro 64 bit version 1511 ISO from "Microsoft Volume Licensing Service Center" - this 4 GB file will take a while to download
- Mounted the ISO file as d:
- Ran this command from an elevated command prompt:
DISM /Online /Cleanup-Image /RestoreHealth /source:WIM:d:\Sources\Install.wim:1 /LimitAccess
- Re-ran "sfc /scannow" after the DISM command above finishes