Prevents users from deleting tasks from the Scheduled Tasks folder.This setting removes the Delete command from the Edit menu in the Scheduled Tasks folder and from the menu that appears when you right-click a task. Also the system does not respond when users try to cut or drag a task from the Scheduled Tasks folder.Note: This setting appears in the Computer Configuration and User Configuration folders. If both settings are configured the setting in Computer Configuration takes precedence over the setting in User Configuration.Important: This setting does not prevent administrators of a computer from using At.exe to delete tasks.
Windows Components\Task Scheduler
Windows Server 2003 Windows XP and Windows 2000 only
HKLM\Software\Policies\Microsoft\Windows\Task Scheduler5.0!Task Deletion