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1. Open control panel by pressing Windows + X to open the power user tasks menus.
2. Now Click on User Accounts > Manage another account. If you are prompted by User Account Control, click "Yes" to go on.
3. Select a password protected login user that you want to reset password in Windows 8.1. And click "Change the password" option.
4. Type in a new password twice for the user account.
It only works on Windows 10 as i know.