This could have 3 different major problems, plus one possible problem.
You may have an issue similar to the 3325 error. Disable all protection software, such as anti-malware, anti-virus, or firewall programs, including Windows firewall.
You may have a slow connection. test your connection speed using an online tool such as SpeedTest.net, or a simple command-line ping to the game server.
You have a slow computer and it's just not loaded yet. I have the minimum RAM on my laptop and it took nearly 30 minutes to load, but played perfectly afterward. Close ALL other non-essential programs before launching the game.
If none of these work try fixing your installation from the launcher menu.