but the error seems to be a problem with settings.php
Have you check that the correct configuration is there (i mean database name, user and password)??
If is yes and you don't have a backup, you should check if the database is ok.
install another installation inside other directory if you have uploaded attachments or install a fresh installation if don't and set it up with that database.
You won't loose any data only a day setting the forum up.
I hope this help you.
Fel, i show the names from the block has dissapear and i can't set them in the block settings??
is just mine forum?