No Network connection Window 7 Pro guest under Hyper V

I have setup Hyper V on my Windows 8.1 laptop, the guest OS is Window 7 Pro. I have followed the eightforum how to

http://www.eightforums.com/tutorials/19359-hyper-v-virtual-switch-manager.html

But still cannot get a connection.

The network icon appear on the win7 taskbar with the yellow exclamation mark on it. The Laptop is connecting via ethernet cable and gets its IP via DHCP. I have set the virtaul adapter on the win7 guest to dhcp and static but still no connection. I have...

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