Is it possible to include login in boot disk for win2k or xp?

I want run boot disk without need to write my login and password each time.

// I want make boot CD that will be able to start windows in DOS mode for scan HD //
// It probably will be 100% easy repair utellity for PC (i think) //
// One for normal mode works good, that I made (collected cmd line progs) //

USB (flash usb) in DOS mode works? Or I need copy to disk and "install" it?

Thx