Task Scheduler not running when logged off

This may be a simple answer that I should know but…. I have cloned clients out in the field that perform certain tasks during the night. They are Windows 2000 machines, SP4, with users set up with specific rights and privledges via local policies. The tasks run flawlessly if a user is signed into windows, but do not run if the computer is sitting at the logon screen. Any way to get the task scheduler to kick off these tasks without being logged on to Windows?

Zane.