Your computer needs to be correctly set up in order to detect a LAN; if there’s any problem with the hardware or the connection itself, the computer will not register the network. Use Windows’ network troubleshooting tool to identify the problem: right-click the Wi-Fi or Ethernet icon on the Taskbar in Desktop mode and select “Troubleshoot Problems.” If your computer isn’t showing a network icon, it may not have a network adapter installed. Writer Bio

My Computer Won t Detect the Local Area Connection - 69