Create a Scheduled Task Script

I would like to create a script that creates a scheduled task and copies a file to a PC with users having restricted access. The scheduled task will run a VB Script that displays a message to mobile users that their network password will expire and they need to change it. What do I need to make sure I have for the username and password in the Schedule task line that will run the task on each user’s PC? I know that if you don’t have a correct username it will not run the task. Also, I do not want to enter a network admin or my account in the script. Thanks