Do not have sufficient access privileges (emac)

I just bought a used emac that was used in a school. i created a new account on the computer and i cannot access any files because it says that i do not have sufficient access privileges. There was only one other account on the computer named administrator, but i cannot log into it for some reason. I have my account set as an admin, but i still can't access these files. How do i change this?


The version is Mac OS X 10.4