Thanks for your help: sadly that didn't work. Nor did any number of fixes found on the internet for corrupt user profiles. It looks like I've got to do a full rebuild of the system.

Thanks dalchina.

I don't think the problems on the two separate computers are related: the one about not being able to create new user accounts at all (or more accurately not being able to use...

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Yes I could try that. Unfortunately I don't have a suitable donor computer though. Thanks. That's also proposed as solution for another problem I have on another w10 computer which...

I'm probably like most people - able to solve the seemingly endless minor windows problems that arise after a bit of google searching on forums. However at the moment I've got two problems that I...