WTH is up with your account creation process!!!!! I can’t use a password because someone else has used it? How freaking idiotic is that. Jeez I already think I made a mistake buying this game. Is it to late to get a refund?
Please check out several tips on security.
And for a detailed outline on the subject of security as it relates to Guild Wars and Guild Wars 2, please see Mike O’Brien’s article on account security.
I think you’ll understand the reason that the password was rejected.