I have almost the exact problem!! I've been using Windows 7 with no problems with my Asus P5B. I use the two onboard ethernet ports to share internet with the rest of the house. I left for vacation last week and came back this week and now one of the ethernet ports is no longer detecting that...
I looked to see if there were any topics that were similar to my problem, but aside from a few that were very close, nothing said something that exactly matched my troubles. I have an Asus P5W DH Deluxe motherboard. This motherboard comes with two ethernet ports built in. According to device...