System: WinXP

Does anyone have any ideas on this situation?

Problem:
I am trying to edit default COM sercurity, I have the appropriate users in
the Access Permissions, but when I try to edit the Launch Permission Users
by going to Run-->dcomcnfg-->component services-->computers-->right click my
computer (properties)-->default COM security tab-->edit default under Launch
Permissions. When the window pops up I do not get the ability to add users
to this sections, the only thing that shows up on the window is "Unable to
display security information". Any assistance would be great, I have done
research on google groups and support.microsoft.com to no avail.

Thanks
Jim