You have it set to run if the user is logged on or not. If you are expecting the notepad window to pop up and be visible, you have to set it to "Run only when user is logged on". Otherwise it will run in the "background" unattached to any user. Check the task manager and see if you have a bunch on notepad's running.
Make sure that you enabled task history and then check the history tab to the task. Also look at the "next run time"