Cause: Old network configuration (IP lease or MAC address cache) conflicts with the new driver. Fix:

Avoid random "driver database" websites that rank high on Google but host unsigned executables. Here are the only three sources you should trust.

Cause: You have an Intel, Killer, or Broadcom NIC, not Realtek. Fix: Check Device Manager → Network adapters. If you see “Intel Ethernet” or “Killer E2500,” delete this installer – it’s for the wrong hardware.

If you need a pure .inf driver for deployment, the Microsoft Update Catalog is excellent. Search for "Realtek PCIe GbE Family Controller" and look for the latest CAB file. Inside, you will find an .sfx.exe-like extraction.

Never download from:

The execution of Rtk-nic-driver-installer.sfx.exe is required under the following circumstances:

No. USB Ethernet adapters (e.g., Realtek RTL8153) use a different driver package. This .sfx.exe is exclusively for PCIe/PCI onboard LAN chips.