Upgrade from ASUS GTX 760 to ASUS GTX 960, Installed new card and booted up, Windows 7 installed new drivers and everything appeared OK only to find that I had no Internet connection. The onboard Broadcom NIC (wired) has disappeared. It's not in Device Manager, not in hidden items. The NIC is enabled in BIOS but Windows doesn't see it. I have reinstalled the latest drivers from Dell--alas 6 yrs old--the drivers from Broadcom and Intel will not install. A system restore did no good. A rescue reinstall of Windows didn't get it back. Looking in Windows system drivers shows that the Broadcom drivers are there but are listed as Disabled. I reinstalled the old GTX 760 until I can find how to get the NIC back. I'll try anything!!!