Windows 10: PC asks for password of wrong Microsoft account after update

I was working, I left the room and when coming back the PC Acer, Windows 10 had updated. Now to unlock it it asks for a password of a Microsoft account connected to an email I don't have access to. I have another Microsoft account, but I see no possibility to insert my own email address or select another user in the screen lock.Until now, when switching the computer on I just had to insert the password of the PC to unlock it, then sometimes when using programs such as Microsoft Teams I was asked the password for a Microsoft account, but unlike now I was able to enter with my own email addres

:)

 

Wrong Password

The "Old Password" is the password to your local account. It is about to change your local account to a Microsoft Account. If you don't mind this, then enter your local account password. If you think this is overly intrusive of Microsoft, don't do it and let Cortana die.

 

Wrong Password

Kevin, it turns out that the "old password" refers to your Windows user password, not a Microsoft account password. In an effort to get people to create/use Microsoft accounts, Microsoft wants you to abandon logging into Windows with your Windows username and password, and instead use your Microsoft account username and password. Thus, if you're still using your Windows username and password to log into Windows, you'll have to enter this as the "old password" when enabling Cortana. The reason they call it the "old password" (while not telling you which password!) is that in addition to enabling Cortana, it will secretly in the background change your Windows logon to require your Microsoft account info instead of your "old" logon info.

Once I got through this, Cortana worked. I tried it out for a couple of hours, found it worthless, and completely removed it from my system (which is also not straightforward; there's another thread devoted to that).

 

How to reset Windwos 8 Password?

http://windows.microsoft.com/en-us/windows/what-do-forget-windows-password#1TC=windows-8

• If you've forgotten your Windows password, there are several ways to retrieve or reset it:
  • If your PC is on a domain, your system administrator must reset your password.
  • If you're using a Microsoft account, you can reset your password online. ...
  • If you're using a local account, use your password hint as a reminder.