How do I change a forgotten password at start up, to bring up the operating system?

The computer is a Gateway, given to me from my sister. She hasent used it for a long time and can't remember the password she gave it. The operating system is Windows XP PRO.How do I change a forgotten password at start up, to bring up the operating system?
Well if the password is for the Windows Xp here is the way to remove it :

when the computer load press F5 continues until it show you list choose %26quot;start windows in Safe mode %26quot;

it will let you get in windows in safe mode that mean you will bypass the password but colors and sound will not be available

then you open my computer and then the drive C:

then make search and type *.pwl this will get you the file with the user's all passwords , just delete it and then reboot the comPutter in normal mode , it will prompt you to enter new password , if you don't want password just press OK and it will save blank password.



if the pass word is for the Bios system i mean it not let u to continue to load windows , then all you have to do is to get out the silver battery and pu it in again all while the computer is off , then turn on the computer it will not prompt for the passwordHow do I change a forgotten password at start up, to bring up the operating system?
reload the computer with the software

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