I can't locate any other account here for you, disabled or otherwise, what was the user name? If it was created a few years ago it may have been archived when we switched forum hosts.
When McAfee is installed Windows 7 wont let you access the security aspects of the system that McAfee now controls, antivirus/antispyware and firewall.
Did you try rebooting with McAfee's firewall turned off (set to never restart)?
Then Windows Firewall should at least be accessible.
You could try asking Technical Support, it's a free phone call or you can use the online chat client, both linked under Useful Links at the top of this page.
Or try joining SevenForums and posting in this thread regarding this: http://www.sevenforums.com/tutorials/522-windows-firewall-turn-off.html
You can always uninstall mcafee, disable windows firewall and only than install it back again, if You want.