The Atheros AR8161 8165 PCI E Gigabit Ethernet Controller (NDIS 6.20) driver allows Windows to communicate with your computer’s wired Ethernet adapter. It helps the operating system recognize the hardware and manage network connections for internet access, local file sharing, and other everyday network tasks.

Key Features

• Wired network connectivity: Provides the software interface needed to connect the Atheros Ethernet controller to a router, switch, or other compatible network equipment.
• Gigabit Ethernet support: Enables the adapter’s supported Ethernet capabilities, including Gigabit operation when the cable, connected equipment, and network configuration allow it. Actual transfer speeds depend on your setup.
• Windows network integration: Lets Windows networking services work with the adapter and exposes available device settings through Device Manager.
• Driver maintenance and recovery: Installing a matching package can help restore an unrecognized Ethernet adapter or address connection issues caused by a missing, damaged, or incompatible driver.

How to Install

1. Confirm the adapter model. Open Device Manager and check under Network adapters. If the controller appears as an unknown device or Ethernet Controller under Other devices, open its Properties and use Details > Hardware Ids to verify the hardware before downloading.

1. Choose a compatible package. Select a driver that explicitly supports your Windows 11, 10, 8, or 7 installation and system architecture. The NDIS 6.20 designation alone does not confirm compatibility with every Windows version, so check the package’s supported systems and any computer-manufacturer guidance.

1. Download and extract the files. Save the driver locally and extract it if supplied as a compressed archive. If Ethernet is your only internet connection and it is not working, download the package on another computer and transfer it using a USB drive.

1. Install the driver. Run the included installer if available. Otherwise, right-click the controller in Device Manager, select Update driver, choose Browse my computer for drivers, and point Windows to the extracted folder. Follow the prompts to complete installation.

1. Restart and test the connection. Restart if requested, then connect an Ethernet cable and check network access. If the adapter still shows a warning or cannot connect, verify the selected driver, cable, and router port. If a new driver causes problems, use Roll Back Driver in the device’s Properties when available.

Common Issues and Fixes

• Install fails or exits silently: Run the Atheros installer as administrator and use the correct 32/64-bit package. If setup still fails, extract the driver and install the INF manually via Device Manager > Update driver > Browse.
• Device not detected: Check Device Manager for an unknown Ethernet Controller. Enable onboard LAN in BIOS, reseat the PCIe card if applicable, then use Action > Scan for hardware changes.
• Version conflicts with Windows Update/older Atheros drivers: Uninstall the existing Atheros/Qualcomm adapter and select “Delete driver software.” Remove stale packages with `pnputil /enum-drivers`, then reboot before installing the matching AR8161/AR8165 NDIS 6.20 driver.