Disable Ctrl+Alt+Del in Windows XP

This is how to prevent working of this famous three key combination in Windows XP.
Start>Run
Type regedit
This opens the registry editor. Browse to the following key
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon
Create a dword entry named "DisableCAD" (excluding ") and put its value to "00000001" (excluding ").