"Restricted Account" preventing access to Norton Firewall 2006

I run XP Home and Norton Firewall 2006.  I’ve been trying to turn off my firewall for a few minutes to do some testing, but I get an error message, “Restricted accounts are not allowed to block or allow traffic.”  I checked in my XP’s User Accounts setting, and I am an administrator.  This was never a problem for me before - seems to be a recent change, though I haven’t done anything to my accounts or  Norton Firewall 2006 anytime recently.  Any ideas?