To find the exact model, you can use the built-in Windows Device Manager.
: RTL8111B, RTL8111C, RTL8111E, RTL8168, and RTL8110 series. Fast Ethernet (10/100M) : RTL8101E, RTL8102E, and RTL8105E. Step-by-Step Installation Guide realtek lan driver for windows 7 64-bit
Without the correct driver, Windows 7 does not know how to "talk" to that hardware. The operating system sees the physical port but cannot send data through it, rendering your wired internet connection useless. To find the exact model, you can use
But for legacy systems that must run Windows 7 x64, the Realtek LAN driver remains a stable, well-tested component when properly configured. To find the exact model