Have you tried using ERD Commander? you need to have a computer with working CD drive, or flash drive to boot to.
Press F10 or F11 at startup (something like that) and boot to CD, you can change passwords using locksmith!
If that fails, and they have password protected the BIOS, yur gonna need a screw drive and open up the case, clear the CMOS (removes password) by connecting the jumpers.
Then start it up and change boot order.
RM networks suck. The head in my school bought it (hes a retard)
It creates huge ammount of excess traffic and slows them right down (used 256mb 600 p3 laptop to access internet and loaded faster than the 1gig 3GHz machines that they had in LOL)
Almost fogot, to get into the BIOS you need to press either F1, F2 or DEL before it beeps. And the laptop that I used was mine and not connected to the domain