I had the same problem.
The Network is not working because the Network driver is not compatible with Windows 8.1
I did this to get it to Work:
1: Rightclick the startmenu and click Device Manager
2: Search for something like Network.
3: Rightclick the driver inside the topic
4: Click on Update Driver
5: Click Search for updates online
Windows will now install the lastest update for your Network driver.
After it said Complete close Down the Device Manager
Now restart your computer. Then it should Work