So I had this same virtual switch connectivity issue with my 2008 r2 VM. Turns out I was experimenting with a 2012 VM and created a DHCP reservation on my router for this VM. What that did was capture the MAC address of Hyper V virtual switch. So when I deleted my 2012 VM (cause I was frustrated with it) it worked fine connecting to the internet. I then installed 2008 R2 and was not able to connect to the internet. What happend was the router captured the MAC address for my 2012 VM and related switch. Deleting this reservation from my router fixed all of my HyperV virtual switch connection problems.
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