How do I disable the ability to change password?

A. Service Pack 4 introduces a new registry entry.

1. Start the registry editor (regedit.exe)
2. Move to HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Policies\System
3. From the Edit menu select New - DWORD value
4. Enter a name of DisableChangePassword and press Enter
5. Double click on the new value and set to 1. Click OK
6. Close the registry editor

Change Password when you press Ctrl-Alt-Del will now be greyed out.