Thank you, but I'm afraid that doesn't explains me a lot. At school we had a big project, and peoples usually bring their laptops. And he was scared someone would fudge up his Facebook account so he changed to a long and difficult password. Which he somehow must've had two typos, both at the type in new password and the confirm new password. He now has no acsess to anything at all.Since he's using a guest user. We're trying to get to know how to reset the computer completely til factory settings.