DEP won't let me point to Outlook data file

I am trying to install my Office XP, but when I try to change where it looks
for my Outlook data file, DEP won't let me. I do it from the mail icon in
control panel, and from the outlook interface as well same problem. I need to
disable DEP for the application. I have disabled it for Outlook, but that
doesn't solve the problem.... HELP!