This is the safest way. Search for the Realtek PCIe FE Family Controller Software.
Check if you are running a 32-bit or 64-bit version of Windows. esonic h61 motherboard lan driver
A. Yes. If LAN driver installation fails repeatedly, a cheap USB Wi-Fi dongle (e.g., from TP-Link) will work immediately because Windows has generic drivers for those. This is the safest way