Eye,
You cannot use Fantastico (when it is updated) to upgrade Moodle. You need to preserve your database and allow the newer Moodle to overwrite tables with changes during an installation. Fantastico, unless you create a Moodle installation using another folder name, is ok for a first time installation.
Make sure you have set Moodle in Administration to perform site backups, and download the latest backup to your computer before upgrading. This backup can be found in your moodledata directory in folder 1. Almost make sure you save your config.php file as this will show you what Fantastico did during its installation (ie, database name and location, user and password names, directory locations etc.).