Built in Admin account added

From: Doug (djailerNOT@yahoo.com)
Date: 11/02/02 

From: "Doug" <djailerNOT@yahoo.com>
Date: Fri, 1 Nov 2002 17:42:42 -0800

I found a user added to my USERS file named CowDung. It
had been given built-in admin rights and could not be
deleted. I renamed the original Admin and gave it a
password. I only use that account to change settings. I
am using ZoneAlarm with a DSL connection. How can I
delete this account? Is this something that is happening
out there? The name seemed kind of unique. I renamed the
file, but what is to say this won't happen again?
Besides, anyone who can add a built in account can likely
browse the USERS file and find this again, right?

Any ideas for keeping the lid on?

Thanks

email should be obvious.

Doug