Cannot find administrator account or password

We just got a new laptop with Vista. I set up user accounts, parental
controls for my kids, passwords for us. Now I am constantly getting the the
"windows needs your permission to continue" popup under every user and I
neither of the passwords that we have created works. In fact, when this
popup comes up, there is not even a line to enter the password. It is so
strange. I feel paralyzed. We have set up four accounts and they all come
up as "standard users", but we must have an administrator account somewhere,
right? Any guidance is appreciated!
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New to Vista