Don't know if you've fixed the issue by now, but I had the exact same problem. The connection would only work if I reinstalled the drivers everytime I needed an internet connection. After restarting windows 1-2 times (I'm on Windows 7 x64) I would be able to connect to my own WPA2-personal / AES network, but I would not be able to acces internet.
What I found to work was to go to the Wireless Adapter Setting in your windows config and disable 802.11n mode, this suddenly made internet available. I have no clue why as I have no knowledge whatsoever about wireless networking but this I found to work. Hope it turns out well for you!