Updating Windows 10 to Windows 10 also has its problems
When updating to the 'Windows 10 Fall Creators Update', it decided that it didn't like the folder which contained my user information, so promptly changed a registry entry and pointed to an empty 'temp' folder - same username/password, different folder. Without knowing what it had done, it appeared that the update had wiped all my installed software and settings, and it took a number of hours before I (a) realised things were still there and (b) found what registry entry to change to get my login pointing to the correct folder again. A non-techy user would have had little chance of fixing it. This techy user did not appreciate waking up to a seemingly 'clean' Windows desktop and the prospect of getting my entire working environment re-installed.
Learned my lesson. I now have Windows Update scheduled for its next update several days in the future, which I constantly kick forward every few days. I'll update when I'm ready, thanks. Just AFTER I do a full system backup, in case it all goes tits up again.