Windows 10: After adding a new user to my Windows PC, Windows rejects password to pre-existing user account

I have added a new Microsoft account as a user on my Windows PC. Now I can login under the new username, but when I try to switch to the pre-existing user, Windows returns message on login screen that password is incorrect. It also rejects that account’s password when I restart machine and try login first to the pre-existing account. - Ideas on how to access my pre-existing account?- I would like to be able to login under both usernames. If that’s not possible, I’m not sure if the original username is the problem or if it’s something else.Thanks for thoughts / suggestions. FYI- The password t

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Strange Windows 10 User Account issue.

Unfortunately I had done those steps numerous reboots, it just, reappears for no good reason. The base account isn't even a Microsoft account, it's a local account.

I haven't quite tried the built in administrator account on W10, but so far in my experience on my own computer, the built in account seemed to have absolutely no more control than I did on my own.

It's just strange, I go in, it warns me twice about deleting the account, then it's gone. Reboot, and it's back?

EDIT: Just to specify, both command line and Netplwiz both say only HIS account exists on the computer, it doesn't list this rogue account. This is what I meant in my first post about the fact that even Windows doesn't seem to believe it exists, HALF the time. *Frown

 

Adding a new user

Hi Alex,

Welcome to Microsoft Community and thank you for your interest in Windows 10.

I will definitely assist you.

Let’s try simple steps and check if it helps. Follow the below steps.

• 
  Type settings on the Windows search bar and select
  Settings.
  
• 
  Click on Accounts, and click on
  Family & other users on the left pane.
  
• 
  Now you can add new user account.
  

Also visit the below link on how to create new user account. (Steps applies to Windows 10).

Manage user accounts in Windows - Microsoft Support

Hope this helps. If you need further assistance with Windows, let us know and will be glad to help.

 

Lost User Account

After upgrading from Window 7 to 10, I lost my wife's User Account got messed up, using my email address and login password, with no ability to change them. I received the reply below, but still have problems:

I understand the inconvenience you are facing with user accounts, we will help you to resolve this issue.



I would like to inform that there can be only one Microsoft user account on one device, and that might be the reason you are unable to change the email address for the user account.



I suggest you to create a new account (Local account) on your computer and transfer the content to newly created user account.



Step 1: Creating a new user account

• Type cmd in the Search bar form the desktop.
• Now, Right-click on cmd.exe from the result and select Run As Administrator.
• User Account Control or UAC dialog box will appear, click on Yes.
• Type net user username password /add
  
  [Replace ‘username’ and ‘password’ with your desired username and password]

Step 2. Copying old files to newly created User Profile

• Go to C:\Users\(Your-Corrupted-
• Copy all files except three files:

• 
  NtUser.dat
  
• 
  NtUser.ini
  
• 
  NtUser.log
  

3. Go to C:\Users\(New-User-Profile-

4. Paste all those copied files here.

I tried to create a new user account as in Step 1, but when I put in the command as written above, I kept getting messages about correct syntax for the command. No matter what I tried, it wouldn't work. I
then tried to set up a new account using the Settings/Accounts/"Add someone else to this PC" menu. I set up the account, but no folder was created under C:\Users\. I tried adding a folder using the new accounts user name and transferred the files from the
other account. When I tried to log in, I received the same error message. I am at a loss as to how to get back the user account with the correct username, email address, and password. HELP!!!