Make sure you have allowed your game through your firewall: http://windows.microsoft.com/en-US/windows-vista/Allow-a-program-to-communicate-through-Windows-Firewall. If this doesn't help, please attach the launcher.log-file in a mail directly to firstname.lastname@example.org.
Location: C:\Users\All Users\Hunter\Launcher\launcher.log
Note that some folders by be set as hidden by default. Type %appdata% in the Address file and manually change the path.