A little more info, to illustrate where the Windows 10 install fails each time:
Going through Windows Update, the 2,092.5 MB of files successfully download.
It then proceeds through preparing for installation
preparing for the upgrade
Microsoft Software License Terms
your upgrade is ready to install - start the upgrade now
configuring update for Windows 10
computer restarts
loading files
upgrading Windows
copying files - 100%
computer restarts
installing features and drivers - 91%
computer restarts
configuring settings
"Your computer has run into a problem and needs to restart"
computer restarts
"Attempting to recover installation",
"Restoring your previous version of Windows"
computer restarts
and......laptop is back to Windows 7, with another failed Windows 10 upgrade failure.