I have a clean install of XP, my NIC is functioning correctly. I can ping a loopback, ipconfig release and renew, and Comcast says they can see my modem and it is "talking back". No AV installed yet, no firewall, no antispyware and I cannot get online with IE, Firefox, etc.
I have rolled back drivers, run netsh winsock reset, all to no avail. I will attempt with my laptop next but am seeking advice.