Where will you be backing up to? Do you have a second disk drive in the system? dvd burner?
Typing ntbackup or NTBACKUP in the run box brings up a window with: "Windows cannot find 'ntbackup'." and goes on to suggest seeing whether the name was typed properly or using Start and then Search.
This computer is a Toshiba, and in the control panel under the performance section there is a Toshiba Power Saver icon. Is this a Toshiba thing?