To configure a desktop Windows operating system to communicate on your LAN using TCP/IP, you must enable the TCP/IP protocol for your ethernet adapter.
Open your Control panel, select the Network panel.
Next, select the Configuration tab.
You will see a list of the various hardware devices, protocols and clients/servers installed on your machine. You will also notice icons down the left hand side which might include computer terminals (for clients), green network cards (for adapter hardware), and the protocol icon which looks like two connected pipes.
Find your ethernet adapter in the list. It should appear at least once. If there is a "TCP/IP" protocol (the connected pipes) associated with your new network adapter - in the above screenshot, the network adapter name is a 3Com (3C562) EtherLink III card - then select it and double click on "Properties" to bring up the TCP/IP dialog box. Configure this dialog box according to your local network settings.
If there is no TCP/IP protocol associated with your ethernet adapter, you need to add a TCP/IP protocol for that adapter.
To do so, move the cursor to highlight the ethernet adapter hardware (the one with the green icon next to it) and click "Add". As is shown below, select "protocol" and click "Add".
In the "Select Network Protocol" screen, choose "Microsoft" as the manufacturer and select "TCP/IP".
When you click on "OK" you will then be able to go back to the "Network Configuration" screen (shown earlier). Select the appropriate adapter and TCP/IP protocol and then click on "Properties" to configure its properties.