missing security tab for file properties in Win2000

From: Connie (constans_at_sfu.ca)
Date: 09/02/04

Date: Thu, 2 Sep 2004 13:33:42 -0700

Hi -
    I am an inept systems manager! I have several machines
running Windows 2000 professional, and on one of them there
is no security tab when you right click on a file or folder
and choose properties - there is only a "General" and a
"Sharing" tab. Can anyone tell me how to get the
"Security" tab back on the file properties window?
    Thanks for any help.