Database error 28! Help!

I don’t know what’s happening, it was working fine but a couple of hours ago it went like this (www.pedro10.com/blog). It shows this message: WordPress database error: [Got error 28 from table handler]
SELECT DISTINCT * FROM wp_posts WHERE 1=1 AND post_date_gmt <= ‘2005-12-31 00:05:59’ AND (post_status = “publish”) GROUP BY wp_posts.ID ORDER BY post_date DESC LIMIT 0, 10

I did not write a new entry or anything like that, i don’t know where all my entries gone, please help, I don’t know what to do.

Thank you very much everybody.