What internet do you use? I doubt its dial-up the way you say "network cable unplugged". Anyhow I would make sure that your Network PCI card was not loosten during installation of the sound card. If it has then you want to turn off your computer, unplug the power supply, and reconnect the PCI Network card to the PCI slot. If it is built into the Mobo, check to see if your router or modem is still connected and working properly. If not just unplug the router then the modem and wait 1 minute. After the minute is up, reconnect the router THEN the modem. If it doesn't still work check to make sure the Ethernet cable is still connected firmly into the Ethernet port.