Look up the user N/A - first step. - If you find someone, delete that user.
Second step - Change all the moderator and admin passwords.
Third step - Check your config.php in your FTP to make sure no one else is listed as super administrator.
Other than that, can't really think of anything else to cover.
Domokun
p.s. Oh yea, check the control panel log to see if there's any odd activity.
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