This is the most common point of failure. Two versions exist:
How to check: Go to Device Manager > Network adapters. If it says "Realtek PCIe GBE", download Realtek driver. If it says "Intel 82567LM", download Intel PROSet driver.
If you cannot find the specific model, download the universal drivers for the components listed below based on your Windows version.
A typical set of drivers needed for the Foxconn 17A0 (or similarly-branded boards) includes:
Because “17A0” alone may be insufficient, identify hardware precisely:
Always assemble drivers for: