How to disable shutdown button on the Log-in screen

Windows 2000 Workstation's log-in screen has a "Shutdown" button which you can use to shutdown the system without ever logging in. But you can disable Windows 2000 Workstation's "Shutdown" button on the initial log-in screen:
• Run "RegEdit.exe" or "RegEdt32.exe"
• Select the following key:

HKEY_LOCAL_MACHINE\
SOFTWARE\Microsoft\Windows NT\
Current Version\Winlogon
• Add a value named "ShutdownWithoutLogon" of type "REG_SZ" and set it to "0".
• Restart Windows