Disable Change Password

User Configuration\Administrative Templates\System\Logon/Logoff

Description

Prevents users from changing their Windows password on demand.

This policy disables the Change Password button on the Windows Security dialog box (which appears when you press CTRL+ALT+DEL).

However, users are still able to change their password when prompted by the system. The system prompts users for a new password when an administrator requires a new password or their password is expiring.