How can I override a forgotten password for windows XP

Forgot the Administrator's Password? (http://www.petri.co.il/forgot_administrator_password.htm)

Here is a link to some ways you can gain access to the system, and change the password.
We aren't able to help you much more than this, because we have no way of telling whether you've forgotten the password or if you just want to access a computer that you don't have access to.