If you've forgotten your Windows password and you're on a domain, you could contact your system administrator to reset your password.
If you're not on a domain, you can reset your password by using a password reset disk or by using an administrator account.
For more information, please refer to http://support.microsoft.com/kb/321305
for details. If you forget the administrator password or don't have a password reset disk nor another administrator account available in your computer, you’ll not be allowed to reset the password. If the situation arises, you won't be able to log in to Windows and should reinstall or recover your Operating System.
May 06, 2019