Windows 10: User account missing from log-in screen. The account missing is also the administrator account

I have a Lenovo laptop. I have created 3 user accounts. Two of which are just for storing personal files, one for my sister, one for my mother. The 3rd account I use for work is the administrator account. My sister was saving files on her account last night, and this morning when I went to log-in to my account the administrator account it is not available on the log-in screen.


How do I find this account and log-in please?

:)

 

Main User Account missing, I need to restore

I don't know what I did but the main user account (and another) is missing at the login screen. I managed to create an administrator's account which is visible but I can't see the other user accounts at login or in the user accounts control panel. I've activated and verified that the missing user accounts are active by using net user "username" /active:yes command prompt. The user's folder's are still on the hard drive. Any suggestions?

 

Deleting User Accounts

more info : when logon screen appear ,user name:administrator (depend os language ) without password --- now you are a super administrator

 

Deleting User Accounts

Does anyone know how to delete an administrator account from another os on another partition (or using a live cd)?

I dont have access to the administrator account and i need to remove the other administrator account