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Ok, this is the solution to the admin lockout:
I hope that you have a backup of your database? Delete your database, create a new one and import your backup. Don't forget to change the database name/pwd in the mainfile.php if the name of your new database of password is different from the original.
If the hacker did a good job you can't change/delete the database through Phpmyadmin. At first I tried to restore a backup but that didn't work! I managed to delete the database with Directadmin...
Luc