Ahhh,
I'm with you now. As it was a security risk, task scheduler disabled changing the account that the task scheduler service could run under. it was the oldest trick in the book for a base user to use the AT command to open a command window,which ran under the context of localsystem, and use that to wreak havoc. this was ten times worse if the service was under a domain account. In it's place the task scheduler allows you to specify who the task will run as on a per task basis. i'm nowhere near an NT box at the moment, but i seem to recall that there was a task scheduler applet in control panel that allowed you to config the tasks as required. there should also be a tasks folder somewhere in the system directory which will have an'add task' icon. Hope this makes things a bit clearer