Admin rights changing

From: Pat K (anonymous_at_discussions.microsoft.com)
Date: 10/27/03 

Date: Mon, 27 Oct 2003 07:25:54 -0800

 Lately the adminstrator account on my client machines
has been lost or changed. I use an account name for the
network administrator. this has now somehow been changed
to the local administrator on the machine with the local
password. What is happening? Is there a virus or have I
inadvertively done something while logging on or looking
at the users screen??