Maybe that name is already in use, people choosing very plain names like "Shadow" or "Angel" will easily bump into already used usernames. I'd suggest you to use another username, and if it tells you the mail address is already in use, then yes, it might be something weird that's up. But then I expect that the mail you're trying to use is not for the acc you're posting with here, or any other account on these boards, or it might be infact that the account was created but never got all the way through.
The golden box is problem for some, but you don't really need to sign into it at all, so don't worry about that one. Focus on the login boxes on the forum index page.
Send me a pm with the mail address you tried to register with via a PM. I will check up on it and see if there's any account that was made with it. If it isn't anything there, you need to try another username. If the mail is used with some other account, I will get back to you and see what we can do about it, possibly delete the account and let you register again.