Network / Sharing :: Two Computers / Same Network Error

I currently am running windows 8 pro on my main computer, two days ago I had left it on for an hour or so and when I came back to it I had no internet conection and the error message I get says there is something wrong with the drivers.

I tried for a while to fix it but had no look. The conection im using is wired and the symbol in the corner has a small yellow triangle over it and says no internet access.

After getting fed up of trying to fix it I plugged in my old computer which is running windows 7 and the conection worked fine all night.

I turned on my computer today and it was working fine still and then after leaving my computer alone for an hour or so I returned to find the internet symbol in the corner with the same yellow triangle over it saying no connection and troubleshooting said something about no ip address.

The only thing I think my main computer was doing when I wasnt on it was updating AVG then when I returned it had no connection. My windows 7 computer also uses AVG but not sure if AVG has anything to do with the problem

Ive tried uninstalling avg and making sure other firewalls are off and also reinstalling drivers but had no luck.