Solution

Because of the large variety of the network configurations, setup, software, hardware operating systems etc not all the information may apply to your network or operating system. First of all verify that the network cable of each computer is properly connected, one end to the NIC card, which is plugged into the computer and one end to the Hub or switch. Ensure that the green light is blinking on the NIC, this shows that the NIC is either receiving or sending the data. On the other hand if the card does not have any lights or has orange or red lights, then is possible that either the NIC adapter is bad or not connected properly.
Make sure that the cables are properly connected to the hub or swtich. Make sure that the newly installed NIC adapter is not conflicting with the other NIC cards on the network and a unique IP address is assigned to each NIC card. If there is some conflict then the device manager may identify the conflicting card. Furthermore, make sure that the NIC is capable of pinging or seeing itself by the ping command. If you are on the TCP/IP network, make sure that the correct protocols are installed. If you are using a firewall, ensure all the ports required are open. While troubleshooting you can close the firewall program so that they there should not occur any conflict.