you might wanna try and disable any anti-virus if you have any installed just for troubleshooting sake. Try to open a safe website such
www.google.com to see if it works. I think I remember something about windows liveone care blocking internet connections. Another thing that you might also wanna try is to flush the DNS using ipconfig. Run the command prompt as administrator and type "ipconfig /flushdns" without the quotes. Tell me if it works.