I pulled the driver that matched the model number to the motherboard that's currently on my desktop from my laptop, moved it to my desktop and ran it and it still won't recognize my ethernet cable. I wanted to see what someone else came up with to see if I was actually grabbing the proper drivers.
EDIT: Figured out which driver it was for the ethernet. r245425, run it as administrator and let it install. You don't even have to restart the computer.
I hope anyone else searching through Google finds this thread.