dog:
If you have Norton Internet Security, its firewall may not be configured correctly. Check the documentation that came with the program. You may be able to temporarily disable the firewall (like i can disable my Norton antivirus program) and see if you are able to connect. If you are, the firewall settings need to be changed.
Have you tried pinging the NIC to see if it is working? At the command prompt, type PING 127.0.0.1. If you get four replies, the network interface card is OK.
Let us know how it goes,
Doc