Lost Security Tab in Sharing and Security Menu

[Martin56]

I have a WinXP Pro machine that is a member of a domain
set-up to share a sub-directory across our network only to
certain domain users.

Over the weekend the machine un shared all directories and
would not log in to the domain.

I managed to get the computer back on the domain, but when
I go to share a subdirectory, there is no security tab so
I may select users. Also if I share the directory, as
soon as I log out as admin the share is lost.

I have checked for virus and none were found. All
software works from the computer.

What may I try to get the Security Tab to show up?

 

[mAcOdIn]

Open any folder, and goto tools, folder options, view, and uncheck "use
simple file sharing" .