Thank you for the prompt reply johnhc. I did what you instructed, but to no avail; Firewall accepted the exception of mmc.exe and dfrg.msc but won't correct my problem. I was even thinking of removing Security Center in some future install.
I'm out of town at the moment, so I don't have access to my LastSession.ini (i.e. the nLited CD); I will post back in a few days.
Edit: I just opened it using right-click and Run As...
using the Administrator built-in account and it worked! This made me think that maybe my account and the Administrator account had different privileges, so I checked; they have the same privileges. Now I'm even more confused
Edited by Sp0iLedBrAt, 19 September 2009 - 10:52 AM.