When I say my TCP/IP settings are identical, I mean that both computers have the same Wireless Network Connection Properties for both their Internet Protocol Version 6 and Internet Protocol Version 4 properties. IPCONFIG shows each has a different IP
address (192.168.0.2 and 192.168.0.3).
I don't see what my internet service provider could do to help. I can get to the internet from 4 other computers using wireless connections and the computer with the problem can connect via an ethernet cable. I am using DSL with a Belkin wireless router
and a Westell modem from AT&T. Even the problem computer can ping all other computers inside the router firewall.
Unlike Manycole30, my DNS server doesn't come and go - it is always gone for only one of my computers and never gone for the others.
Any other good ideas?