Windows Media Center Edition - User accounts

[Judge Dread]

[Judge Dread]I am running Windows Media Center Edition version 5.1 - sp2
Windows Media Center Edition firewall - McAfee Security Center
When I got it, it had the administrator account on it, I added a password to the account and
it gave me the option to make my files private, i took that, no problems there,
I have since then created a new account for my brother as he uses it more then me now,
his account has administrator access, i created a new administrator account for myself, i then deleted my old account and my files,
which doesnt delete the default administrator account, just the files.
I logged into my new administrator account, created a password for it and then found that the option for make my files was private gone,
not even there to click,my brother has alot of pc know how, like me, but this problem has us both at our wits ends, his files on his account are private.
can anyone help me on this,
I have searched the net on how to recover this option and make my files private on my administrator account but cant figure this out at all.
I am completely at my wits end. someone please help, many thanks.