Dell Octiplex 745 Windows 10 build 1040
Windows Update: 2 days to download; Install always fails.
Upd. on USB with Media Creation tool: stops, demands boot from HD. After reboot: setup will not respond.
Can not find a Restore Point earlier than March, can not get behind the problem.
Always fail:
SFC & DISM: in cmd window, as Admin, Power Shell & Windows Repair; in Safe Mode.
Reset
All the options I can find.
More: 1TB external inaccessible. Attempted driver update looped and locked up.
Firefox updated to 45, quit, removed. Will not reinstall: extracts and quits. Earlier versions also fail to install. Only one that works is on the external.
Google Chrome Update will not install.
Extra: tried to use DISM with files from original distro on USB. Failed. Tried recovery and reset with org. distro. failed. Overwrote org. distro. with Recovery Disk. Recovery Disk failed.