I presumed you're trying to use "fordv10" as a login name for the Classifieds, that username is already in registered. Hence the message that the username is invalid when you try to re-register.
Apparently, assuming that account belongs to you, you're using the wrong password.
I've keyed in a password reset request which will generate a new password to be sent to the email address provided by registered user of that account. That address is "email@example.com", if that's you you'll receive the new password.
Reminder: The Classifieds and Photo Albums are separate entities from the forums that we have linked together. They require a separate username and password, most folks just use the same one that is used in the forums.
Let us know if you get in or not.