Did you make sure to apply the latest monthly patch? If not download it from there:
http://pandoraonline.net/forum/showthread.php?tid=2097
If you don't have this file, your client is not trying to connect to us, which is why it would not work. Also, make sure to start the game using the client hero.exe from your RO folder.
Secondly, make sure the login name you are trying to create is original, as we already have over 3000 accounts, most common names are taken already.
Let me know if this helps ^_^