I will guess your using XP from the 1394 ?
Does your router have a modem in it (router/ modem)?
Also is a PCI card (NIC) ethernet RJ45? or are you using firewire(1394)?
To test your NIC (card) go to>start>run>cmd>ping 127.0.0.1 "this should give you reply's if Windows is seeing NIC"
I believe where gonna need answers to others question to help you more.Your full setup and OS.