Ok, so you say you forgot or lost your Windows administrator's password, huh? Oh well, it doesn't really matter if you did or you just say you did. The fact is that you need to gain access to a computer and you cannot "remember" the administrator's password.
How can you get out of this situation without formatting and re-installing the operating system?
Here are several programs to help you. http://www.petri.co.il/forgot_administrator_password.htm