How to hack xp password ?

To change administrator password without knowing the existing password,
Open command type lusrmgr.msc,
Then ..
a window opens click on user, on right side it will display the list of user accounts,
right click on the user u want to change .......
password, click on set password then click on proceed then type the password u want, and retype it.
That’s it you have changed the user password successfully.