I’m sorry but how does that response answer the problem I explained? What’s happening is that new pages that DO exist are resolving to 404 errors (because of permalink caching issues within the wp_options table). Defining a 404 document is not the solution.
If you have access to the backend database, you can update the values in wp_users (at a minimum, change user_login, user_nicename and user_email). Then use the “Lost your password?” option on the login page to get a new password.
Passwords are stored in a special hash formatting (see phpass 0.1) if you want to get your geek on. But, really it’s much easier to go the password reset route!
