The other easy way to reset your winXP admin password is by using WinXP Live2
Here is the procedure:
WIN XP Live2
http://lost-contact.mit.edu/afs/net/project/afs32/mech.kth.se/home/mech/pe/winxpe2.iso
- Download WinXP Live2 ISO and then burn it to CD.
- Boot your computer using the live cd, delete sam file in c:\windows\system32\config folder.
- Reboot windows, your admin password is resetted.
WIN XP Live2
http://lost-contact.mit.edu/afs/net/project/afs32/mech.kth.se/home/mech/pe/winxpe2.iso