Download the free program called OPHCRACK for Windows . As you have XP download that version and burn the ISO to a CD. Then enter your BIOS and change the boot order to boot from a CD. Then insert the CD into your CD/DVD drive and restart your computer to run the program. It will scan your computer and find all of your passwords .Take a note of the one you need to log on to your computer and then close the program. With the password found you will be able to log on to your computer . Make sure you go to your BIOS and change the boot order back o boot from the hard drive.