Since this is a legacy PCI card, modern Windows versions usually include a "plug-and-play" driver. If it isn't recognized, download the Realtek PCI GBE Family Controller drivers directly from the Realtek Downloads Center How to Install the LP-550G Driver Identify the Chipset Right-click the Start button and select Device Manager Find the "Ethernet Controller" under Other Devices (it will likely have a yellow exclamation mark). Right-click it > Properties Hardware Ids from the dropdown. Look for a code like VEN_10EC&DEV_8169 is Realtek. Manual Update Download the ZIP file containing the driver. Device Manager , right-click the controller and select Update driver "Browse my computer for drivers" and point it to the folder where you extracted the files. Verify Connection Once installed, the device should appear under Network adapters