Strict Standards: require_once() [function.require-once]

[IvoLeite]

you can delete everything in the forum root, the Themes and the Sources folders and all subdirectories of Themes and Sources.
KEEP A COPY of settings.php forum root.
Don't clear the other directories like avatars and attachments.

Then load a clean set of forum files (extract the large upgrade package into the forum root with Sources and Themes.)

now you'll have a clean forum installation with all the database stuff still there.

Thank you Kindred.
I would keep the attch and avatars folders, but probably the settings.php would be deleted. Thanks for reminding me.

Cheers.
Topic solved!