Hello acrylian,
Thanks a lot for your answer.
I've visited your link.
Here is what hapenned for the first 2 steps :
1 - "If you supplied an email address in the Admin options..." : I didn't put an email address, just "admin"
2 - if no email, "you need to delete the administrators table in your database and re-run setup." --> HOW CAN I DO THAT ?
I have a ftp connexion. I don't remember where the admin. table are...
Thanks a lot once more for your help !
Gilles