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If, for some reason, you decided that you didn’t want users of a Windows 2000
computer to be able to change their password unless prompted to, you can make
this Registry change to implement that:
Hive: HKEY_CURRENT_USER
Key: Software\Microsoft\Windows\CurrentVersion\Policies\System
Name: DisableChangePassword
Data Type: REG_DWORD
Value: 1
A value of 0 means they can change their password whenever they want to. A value
of 1 means that users will not be able to change their password unless prompted (by
the password expiring, or by the box next to "User Must Change Password at Next
Logon" being checked). Please use caution and frequent backups when working with
the Registry.