For anyone not helped by the "solution" marked above, this is the next step.
Basically this is a failed Windows Update install. The solution I found was to reinstall the newest Windows patch over the top, and it fixed everything and I was back to before the issue happened.
- Download latest Windows full patch, right now I believe 1803 or 1809, which will be a .ISO file, most likely 64bit.
https://wccftech.com/download-windows-10-1809-iso/
2.On a working system, format a thumb drive to NTFS (file size restriction) and copy the contents of the .ISO into a folder.
3.On defective computer, hit CTRL+SHIFT+ESC to bring up task manager. You may have to click "more options" to see menu.
4.Under File menu, top left, click "run new task", and "browse". This is the only way I was able to access my file system.
5.Find your thumb drive with extracted Windows patch, and run the Setup file, clicking the box to "run as Administrator". This will run the update again.
After reboot you will be good to go. I've seen this work for two systems, and about 6 here on the forums.