It's supposed to have this LAN controller: "Realtek® 8111E" , 1 x Gigabit LAN Controller(s)
Look for driver on Realtek site, most often they make drivers for many windows versions in same file:
Or try here: http://www.techspot.com/downloads/drivers/essentials/realtek-lan-for-windows-10/
Just first make sure it's on in the BIOS.