How to reset windows 2000 password if the password is lost, forgotten or unknown?

A new Windows 2000 installation, or a Windows 2000 upgrade from Microsoft Windows 95 or Microsoft Windows 98, may unexpectedly prompt you for a password. The following notification occurs when you log on to the Windows

2000-based computer:
Logon Message:

The system could not log you on. Make sure your user name and domain are correct, then type your password again. Letters in passwords must be typed using the correct case. Make sure that Caps Lock is not accidentally on.
1. The Windows 2000 security model is based on the Microsoft Windows NT security model. This security model requires a user name and password before access to the computer is granted.

The Windows 2000 security model is different from the Windows 95/98 security model in that no authentication is required to obtain access to a computer running Windows 95/98. Users who upgrade from Windows 95/98 to Windows 2000 Professional may not be aware of these differences. If a user password is lost, forgotten, or unknown, the only method to reset the password is for the administrator (or a user with administrative access) to log on and reset the password in Computer Management. There is no method in the Windows 2000 security model to bypass, disable, or reset the password.

If a user account needs to be reset, logon as the administrator or as a user with administrative access, and then follow these steps:
1. Click Start, point to Programs, click Control Panel, double-click Administrative Tools, and then double-click Computer Management.
2. Expand the Local Users And Groups object under System Tools, and then click the Users folder.
3. In the right pane, right-click the appropriate user object, and then click Set Password.
4. Type the appropriate password, and then click OK.
5. Click OK to acknowledge that the password change succeeded.
6. Close the Computer Management console and Administrative Tools windows.
7. The user can log on with the new password.
If the administrator password is lost, forgotten, or unknown, access to the computer may not be obtainable and the operating system may need to be reinstalled. If the operating system is reinstalled, all previously installed programs and drivers will need to be reinstalled to operate successfully. Data files such as Microsoft Money files, Microsoft Outlook mailbox files, and so on, should not be affected by reinstalling the operating system, but these files will be lost if the hard disk is reformatted during the reinstallation of the operating system. But in fact there do be some software tools for you to use to remove the password and login without reinstalling the OS, like windows password reset, Windows Key and Active Password Changer, etc. All these are disk-based programs for you to burn the file onto disk firstly and then boot the computer from CD/DVD and remove the password instantly.