When I tried, unsuccessfully, to add another user to my laptop, I experienced several failures. Although the new user showed up as an option (after following the online instructions), I could not sign on with the new user. Each time I tried, something else seemed to go wrong. Now my start menu does not work. I cannot get to a restore point farther back than 2 weeks ago. My keyboard stopped working. Reset options all failed to complete.
Microsoft tried and said the only viable option left was to do a clean install of Windows 10. Subsequently they said my model could not support Windows 10, although I was able to run it after an update from HP following the original release of Windows 10. I need my laptop back.