Parental Control settings

Question

I have a "new to me" Toshiba A-15-S129 computer which has a password on the parental controls for internet searching. I can not get in touch with the person who sold it to me. How can I reset or bypass the need for a password? I thought about using system restore to go back to original settings but they must never have set up any restore points. It only goes back to last week when I bought it. It is running Windows XP Homethanks