Your firewall could be blocking it. Idk. Before I uninstalled and reinstalled it though, I found the Pando Media program and uninstalled it. Ran Combat Arms, of course it wouldn't let me go into an actual game because that controls servers, etc. But yeah after I did that, THEN I uninstalled and reinstalled.. Try simply deleting the whole Nexon folder and emptying the Recycle Bin and then going to the site and redoing it. If it still doesn't work, just be patient. Nexon is currently working on this problem.