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How to disable shutdown button on the Log-in screen

Unlike in Windows NT Server, Windows NT Workstation's log-in screen has a "Shutdown" button which you can use to shutdown the system without ever logging in. Here's how to disable Windows NT Workstation's "Shutdown" button on the initial log-in screen:

• Run "Registry Editor" (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