Have you turned off all of your firewalls and anti-virus software?
Also load the game directly from the client itself instead of the loader and see if that works.
Hello everyone,
I had the same nasty problem or very similar to it.
But I've just solved it right now.
So if you are using win 7 try to change the compatibility to run the game under win XP SP2
and for win XP SP3 users try to run the game under win 98/ME
I hope that may help.
Gameguard told me it was avast, but I just uninstalled zonealarm, and now the game works!