LOST PASSWORD FOR NOTEBOOK PC

MY SISTER WENT ON VACATION FOR COUPLE OF WEEKS.
WHEN SHE RETURNED TO WORK, SHE COULD NOT ACCESS
HER NOTEBOOK COMPUTER.WHEN I ATTEMPTED TO ACCESS HER PC.I REALIZED IT WAS A BIOS/SUPERVISOR PASS-
WORD. WHEN I ASKED HER WHY DID SHE PUT THE PASS-WORDIN BIOS? HER REPLY WAS A FRIEND SETUP HER MACHINE FOR HER.I’VE ASSEMBLED MANY COMPUTERS,
BUT THIS IS THE FIRST TIME I’VE ENCOUNTERED THIS
PROBLEM.NEED HELP QUICK.SHE CANNOT PREFORM A GREAT DEAL OF HER AT HOME WORK.