Re: Computer doesn't see ethernet controller after driver installation.
Roll back the driver, remove it completely from the system if you can, then go into safe mode and make sure there aren't duplicates in the device manager. Run a full malware bytes scan, let it fix anything then reboot. Don't use the latest driver for the Realtek Gigabit interfaces, I've had horrid luck with their latest drivers. Find one from 2008 if you can and install it, those seem to be the best for the gigabit nics for some reason.