You already created an account and the wizard pops up because you still try to login with a char. Individual char logins don't work anymore, login with your new account name + password to access all your chars. If you don't remember the account name/password use the ingame password reset on an official server (key Q then M then P then Y (or Z if you have a QWERTZ keyboard)). It will tell you the account name and resets your password.
