Locked laptop?

O.K I POSTED THIS EARLY AND GOT A LITTLE BIT OF HELP BUT I DIDNT INCLUDE ENOUGH INFO. MY UNCLE JUST PED AND HE HAS A DELL LAPTOP THAT IS LOCKED!!!! WE DO NOT KNOW THE PWORD THAT HE HAS PUT ON THERE.I BELIEVE THAT I GOT P THE PWORD PART BUT HE ALSO HAS SOME CISCO SYSTEM PWORD ON HERE THAT I DONT KNOW THE PWORD TO ALSO.WE HAVE TRIED EVERY WORD THAT WE CAN THINK OF AND NOTHING.IT IS THE PASSWORD THAT IS UNDER THE USER NAME.MY COUSIN HAD A COPY OF XP AND WE THOUGHT THAT WOULD WORK BUT SEEING THAT WE CANT EVEN GET INTO THE COMPUTER WE CANT GET THE DISK TO DO NOTHING. HE HAS SOME REALLY IMPORTANT FAMILY INFORMATION ON THERE AND WE NEED TO KNOW HOW CAN WE GET PASS THE UNKNOWN PASSWORD. PLEASE IF YOU CAN HELP E-MAIL ME BACK HIS SERVICES ARE TOMORROW AND I NEED TO BE INSIDE OF HIS COMPUTER BY THEN