You can go in as a GUEST.I just tried to login using my current user name and password. It would not let me in either. But GUEST works fine.
The old GTA site is a static copy. Another words, it's a copy of the last backup before we switched over. You would need to know your old credentials since there's nothing you can do actively there but read.What was your former username? Seems there is no mr007s or mr007 listed on the old forum.