'Matt' used to be the owner and administrator of the laptop. Gill put her name into the administrator field and changed it to her own password because she was now having the laptop from Matt. Matt's name was no longer showing anywhere as a user or admin. We thought when we rebooted the laptop it would automatically show 'Gill' and allow her to put in her password to get into the system and Windows 10. But switch on the computer it shows Matt still and wont accept any password for him now, and no longer recognises him as a user. How do we get into the laptop now? I know we've made a complete mess of it :-( Help and advise really appreciated. Thanks.