DELL latitude 100l, someone disabled all boot devices then set config / administrator password. Please help

Boot Priority on Dell Latitude 100L

1. Turn On Your PC
   Have you ever noticed the messages that pop up on the screen as soon as you turn on your PC? These messages tell you a key combination you can press to enter "Setup" or the "BIOS." Watch your screen and see if you can read what keys to press.
   
2. Press the Keys to Enter Setup Mode
   If you did not see a message telling you what keys to press, try tapping the following possibilities as you turn on the machine:
   
   • Esc
     
   • F2
     
   • F12
     
   • F10
     
   • F1
     
   After pressing Esc or other key, you will most likely see instructions telling you how to enter "Setup Mode". Follow those instructions.
   On some computers, you must hold down the key before you press the power button to turn on the computer. For example, if you are converting a Toshiba laptop to a Linux Workstation, you must hold down the Esc key and then press the power button. The computer then asks you to press F1, and you can then set the "Boot Priority."
   
3. Using the Arrow Keys, Choose the "Boot," "Boot Order," or "Boot Priority" Option
   The menu of choices you see will be different for different kinds of computers. Remember that the choice you want is the "Boot" order or "Boot Priority." On some computers, this is called the "Start Up Options" or "Start Up Sequences." You are going to change where the PC will look for boot information when it starts up. (CD-ROM, HARD DRIVE/HDD, LAN, FLOPPY, USB). If you wish to boot from your Hard drive, then select it as your First Priority.
   
4. Using the instructions on the screen, save your settings and start up your PC. The PC must boot from the HDD. Regrds