Stupid question about password protect

I am having brain freeze and I hope someone will be able to help me when they are done laughing at me! LOL! I bought a used computer that has Windows 2000 Pro installed on it, it boots up to the password screen, however I do not know the password and the person who sold it to me can't remember because it was her son's. I know there is a way to bypass that and remove it, but I cannot remember. Is there anyone who can help me? Thanks!!!!!