Try this first:
http://pirategalaxy.com/support/medic
It might tell whats wrong...
If you have recently switched XP to Windows 7, your system might not have newest Java. Download it from http://www.java.com
Other important thing, check that your firewall isnt blocking game connections.
If nothing helps send support ticket on
http://support.splitscreenstudios.com/ (splitscreen)
or
https://ticket.gamigogames.de/index.php?_m=tickets&_a=submit (gamigo)
(I would say this might be firewall problem, since you said "cant loading the game in browser and client")