How to remove Ctrl-Alt-Del on startup on windows 2000 server

I have a windows 2000 server and I am trying to change the require user to Ctrl-Alt-Del
when logging on. I went to the administrator account and the button to check this at the secure boot settings option is grayed out. So I cannot check this option

I found an article on how to enable the Ctrl-Alt-Delete boxes, open Regedit and go to
HKEY_LOCAL_MACHINE\Software\Microsoft\WindowsNT\CurrentVersion\Winlogon. It says to create a new DWORD value and name it “DisableCAD” The value should be set to “0”

When I go to HKEY_LOCAL_MACHINE\Software\Microsoft\WindowsNT\CurrentVersion\Winlogon I do not see “DisableCAD”. I do see ?AutoAdminLogin? and the data value is set to ?0?. Should this be set to ?1??

THanks for your help in advance.
Sam