Why can't I use the Windows 2000 Scheduled Task Wizard to schedule a new task with SYSTEM account credentials?

If you attempt to specify the SYSTEM account when you use the
Scheduled Task Wizard to create a new task, Win2K will display the
following error message:

The attempt to log on to the account associated with the task failed, therefore, the task did not run.

The specific error is: 0x80070057: The parameter is incorrect.
Verify that the task's Run-as name and password are valid and try
again.

This error message results from a bug in the Win2K Scheduled Task
Wizard. To work around this problem, use the AT command to schedule
your tasks--the AT command automatically uses SYSTEM account
credentials to run tasks. If you subsequently use the Scheduled Task
Wizard to modify an existing task that you created with the AT command,
you'll have to enter alternative credentials for the task, and the task
will no longer run under the SYSTEM account.