Actually, someone found how to fix the problem ??
I really thanked him, my site is now back, and I’ve done a back-up of the database.
The problem with Wamp was due to a desinstallation of aestan tray menu. I then reinstalled WampServer. After having reinstalled wordpress in this second folder of wamp, based in C:\wamp2\www and having edited the wp-config.php, I edited the file my.ini located in wamp\bin\mysql\mysqlx-x-x\ in order to give an other folder of location for the databases (outside of the wamp folder). I then reinstalled the previous theme of wordpress and everything came back to normal. (And I now made a backup of my database ?? )
Thanks for your reply !
Jonathan
