Error database

Hi!
Since a few hours ago when I try to enter the blog (giragonza.blog.cat) gives me an error in the database. When i try to repair the database what I get is:

wp_6964_posts: Table ‘blogcat.wp_6964_posts’ doesn’t exist
wp_6964_comments: Table ‘blogcat.wp_6964_comments’ doesn’t exist
wp_6964_links: Table ‘blogcat.wp_6964_links’ doesn’t exist
wp_6964_options: Table ‘blogcat.wp_6964_options’ doesn’t exist
wp_6964_postmeta: Table ‘blogcat.wp_6964_postmeta’ doesn’t exist
wp_6964_terms: Table ‘blogcat.wp_6964_terms’ doesn’t exist
wp_6964_term_taxonomy: Table ‘blogcat.wp_6964_term_taxonomy’ doesn’t exist
wp_6964_term_relationships: Table ‘blogcat.wp_6964_term_relationships’ doesn’t exist
wp_6964_commentmeta: Table ‘blogcat.wp_6964_commentmeta’ doesn’t exist

Does anyone know what happens? What is the problem and how do I fix it?
Thank you for all