Admin password for XP Pro
We recently got a computer that has Windows XP Professional installed on it. The only account on the startup page is "Administrator" and it has a password - we don't know the password and the person we got the computer from doesn't know the password.
Is there a way to reset or change the admin password? I found a possible way to do it but it requires using the "Guest" account; there isn't even a "Guest" account listed so I have no idea how to get past the startup page at this point.