Realtek RTL8139 810x Family Fast Ethernet NIC Driver

The Realtek RTL8139 810x Family Fast Ethernet NIC driver lets Windows communicate with your RealTek network adapter so your PC can connect to a wired Ethernet network. It is useful when reinstalling Windows, setting up an older desktop, or troubleshooting an Ethernet adapter that appears as an unknown device in Device Manager.

Key Features

• Wired network connectivity: Enables compatible RTL8139/810x family adapters to access local networks and the internet through an Ethernet cable.
• Fast Ethernet support: Provides driver support for the adapter’s 10/100 Mbps networking capabilities; actual speeds depend on your connection and network equipment.
• Windows device recognition: Helps Windows identify and manage the network adapter correctly rather than leaving it listed as an unrecognized Ethernet controller.
• Connection troubleshooting: Installing a compatible driver can resolve missing-driver errors and some connectivity problems caused by an incorrect or damaged installation.

How to Install Realtek RTL8139 810x Family Fast Ethernet NIC Driver

1. Identify your adapter and Windows version. Open Device Manager and check the adapter under Network adapters or Other devices. If necessary, view its hardware IDs under Properties > Details to confirm the exact model.
2. Choose a compatible package. Before selecting a Realtek RTL8139 810x Family Fast Ethernet NIC driver download for Windows, check the package’s supported hardware, operating systems, and 32-bit or 64-bit architecture. For Windows 11, 10, 8, or 7, verify compatibility individually—older drivers are not automatically suitable for Windows 10/11.
3. Download and prepare the files. Choose a trusted free download from the hardware manufacturer or another verified source. Extract the archive if needed. If the PC has no internet connection, download the files on another computer and transfer them using a USB drive.
4. Install the driver. Run the included installer, or right-click the adapter in Device Manager, select Update driver > Browse my computer for drivers, and point Windows to the extracted folder. Avoid forcing installation if Windows reports incompatible hardware.
5. Restart and test. Restart if prompted, connect an Ethernet cable, and check that the adapter appears without a warning icon. Test access to your router or a webpage.

Keep your driver updated when a compatible release addresses a problem or improves reliability. The latest version is only useful if it supports your specific adapter and operating system; check compatibility before applying any update, especially on newer Windows installations.

Common Issues and Fixes

• Install fails (Code 28/52, unsigned driver): The RTL8139/810x package is often older and unsigned on modern Windows. Use the latest signed Realtek driver, run the installer as administrator, or update via Device Manager. For Code 52, temporarily disable driver signature enforcement only during install.
• Device not detected: Confirm the PCI card is seated and enabled in BIOS. In Device Manager, scan for hardware changes and check that the hardware ID matches RTL8139/810x. Try another PCI slot; this NIC will not appear if the slot or onboard Ethernet is disabled.
• Version conflicts/duplicate adapters: Uninstall old Realtek Ethernet drivers and remove hidden duplicate NIC entries in Device Manager before installing. Avoid mixing motherboard and add-in RTL8139 drivers; install one package matching the adapter’s hardware ID.