We noticed that a lot of customer PC’s where coming in with the same problem after installing a Windows update, specifically the April update. After a few hours of troubleshooting, the only conclusion to fixing the problem was creating a USB Windows 10 installation media and reinitiating the update process from the USB media (It will reinstall windows but download everything via USB update instead of the OS). We tried everything (sfc /scannow, dism…) and this was the ONLY solution that worked. So the solution to your broken windows is simply restarting the updating process through a Windows 10 USB installation media, the process should leave all your old files intact and only fix the broken OS, specifically the Administrative/System accounts which is what caused this problem originally.
I’m a bilingual Network Engineer. I have over 20 Years of Professional experience in Computer Science & Information Technology. I currently own and operate Web Semantics (www.websemantics.com) in Vancouver, Washington. I provide bilingual (English & Spanish) enterprise-level IT support to small and medium-sized businesses across the West Coast. I dislike those who think they are cunning, who are dishonest, and who like to take advantage of others. Like Julian Assange, I enjoy crushing bastards. View all posts by Miguel