I had just updated my Network Card on my Windows 7 partition and could not get my Network Card to connect to the Internet.
On my initial boot-in to my Windows 7 bootcamp on my MacBook Pro a message about available Apple Updates popped up and one was my Network card needed to be updated. The Update downloaded fine and I was then asked to restart my MacBook Pro which I did and I had No Connection to the Internet.
After an hour chat with Apple Support with uninstalling the Network Adapters through Device Manager several times I was getting a message about a problem with my Firewall. Windows Firewall under Security was saying my Firewall was being handled by Bitdefender.
It turned out that somehow during the update something got changed in my Internet Security program Bitdefender. So I went to my Control Panel and selected under Programs - Uninstall Programs and selected Bitdefender and it's confirmation panel popped up with two option Uninstall and Repair to which I chose Repair. Once done I was connected to the Internet.
I am unsure if Windows 7's Firewall could be the issue when one does not have a third party Internet Security Software installed. Hope this helps.