GRAZIE, RISOLTO ! NON SO BENE COSA AVESSI COMBINATO... MA HO RISOLTO PROBLEMA RISOLTO GRAZIE AD OTTIMO SITO:
www.alledia.com/blog/joomla-tips-%26-tricks/(How to Reset a Lost SuperAdmin Password)
If you do lose your SuperAdmin password for Joomla, don't worry because theres an easy way to get it back. Just login to your MySQL database and run this query for versions up to Joomla 1.0.12.
UPDATE `jos_users` SET `name` = 'admin', `password` = '21232f297a57a5a743894a0e4a801fc3' WHERE `id` =62 LIMIT 1 ;