I think you mean: you've installed Windows in boot camp, and you want to connect Windows to your LAN.
You need to connect. to the network, go to network connections, click on the network connection you are using, go to "properties", go to "TCP/IP", click "properties", and fill out the details.
Can we perhaps find out why you need to run windows and see if there's a Mac alternative to whatever program you think you may need so you don't have to go through the frustrations of Windows?