If you saved your Settings folder, there is a file - login.cfg - which you can open with something like Notepad, which contains your username and password. If not, then call HTC and you'll get sorted very quickly.
BTW, when you try to login and click Resend Password, are you entering your Login name or GameID? It should be your Login name so if you are entering your GameID instead, that is probably what is causing the problem..... just an idea anyway.