the closest to something that should work is 1.php. don't bother with the other 2, theres to many problems with them.
in 1.php, you have 2 problems preventing it from working:
1) IN the recordset, you have set the email column to filter on a form element named "email". In the registration form, the email form element is named "Email_Address"
you need to change the recordset to filter the email column on the form element named "Email_Address"
2) in the server validation, you have set the Server Variable for the numeric validation to "rstotalRows_rsEmail", you need to change this to "$totalRows_rsEmail"