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QUOTE:
Spero tu abbia fatto un backup del database prima di reinstallare joomla, altrimenti puoi dire ciao ciao ai tuoi contenuti.

Tutte le impostazioni del backend e dei contenuti vengono salvate nel database mysql. Se non le vedi più significa che hai azzerato il database.

500 - Table 'sito.tbwuk_contact_details' doesn't exist SQL=SELECT a.id, a.asset_id, a.title, a.alias, a.title_alias, a.introtext, a.fulltext, CASE WHEN badcats.id is null THEN a.state ELSE 0 END AS state, a.mask, a.catid, a.created, a.created_by, a.created_by_alias, a.modified, a.modified_by, a.checked_out, a.checked_out_time, a.publish_up, a.publish_down, a.images, a.urls, a.attribs, a.version, a.parentid, a.ordering, a.metakey, a.metadesc, a.access, a.hits, a.metadata, a.featured, a.language, a.xreference,c.title AS category_title, c.alias AS category_alias, c.access AS category_access,u.name AS author,contact.id as contactid,parent.title as parent_title, parent.id as parent_id, parent.path as parent_route, parent.alias as parent_alias,ROUND( v.rating_sum / v.rating_count ) AS rating, v.rating_count as rating_count FROM tbwuk_content AS a LEFT JOIN tbwuk_categories AS c on c.id = a.catid LEFT JOIN tbwuk_users AS u on u.id = a.created_by LEFT JOIN tbwuk_contact_details AS contact on contact.user_id = a.created_by LEFT JOIN tbwuk_categories as parent ON parent.id = c.parent_id LEFT JOIN tbwuk_content_rating AS v ON a.id = v.content_id LEFT OUTER JOIN (SELECT cat.id as id FROM tbwuk_categories AS cat JOIN tbwuk_categories AS parent ON cat.lft BETWEEN parent.lft AND parent.rgt WHERE parent.extension = 'com_content' AND parent.published <= 0 GROUP BY cat.id) AS badcats ON badcats.id = c.id WHERE a.id = 3 AND (a.publish_up = '0000-00-00 00:00:00' OR a.publish_up <= '2011-10-05 13:13:39' AND (a.publish_down = '0000-00-00 00:00:00' OR a.publish_down >= '2011-10-05 13:13:39' AND (a.state = 1 OR a.state =2)

QUOTE:
Ti sta dicendo che una determinata tabella nel database non esiste. Vai a vedere in phpmyadmin se c'è qualcosa di simile a "sito.tbwuk_contact_details". Se non c'è è stata cancellata oppure c'è un bug nel componente che stai utilizzando.

QUOTE:
bak_tbwuk_contact_details?

a te serve "tbwuk_contact_details"

elimina il bak_ nel nome della tabella e riprova.