I upgrated to 2.8.4 and it´s all right, but when i logon on wp-admin instead of going to the dashboard, it appears the hosting page and said that the requested page was not found.
So i return to my homepage and te edit link at the buttom of a post show up, so i went there and surprise!! the dashboard worked again!! but when i want to go to de dashboard link, or the comments page, it went again to my hosting homepage.
I checked the WP-CONFIG.PHP data and it is all right, the DB Name, DB User, DB Passwrd and DB Host, also checked the Authentication Unique Keys but still failing.