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Ettercap,

Отметьте пункт Run whether user is logged on or not.

Скрытый текст

Пункт Hidden отвечает за скрытие задачи из списка самого Планировщика:

The general properties of a task are displayed on the General tab of the Task Properties or Create Task dialog box. The general properties of a task include the task name, author, description, security options, the operating system that the task is configured for, and a property that controls whether the task is hidden. When you create a task in a task folder, you must name the task. No two tasks can have the same name if they are in the same task folder. The task description is optional. Task security options specify the security context that the task runs under. For more information, see Task Security Context. By default, hidden tasks are not shown in the Task Scheduler user interface. You can view hidden tasks when Show Hidden Tasks is selected in the View menu. You make a task hidden when you click the Hidden check box on the General tab of the Task Properties or Create Task dialog box.

Источник: General Task Properties