Database error 127

Hi there. All of a sudden, my site has randomly started displaying the following pasted text, when a particular catagory on the site menu is clicked:

WordPress database error: [Got error 127 from table handler]
SELECT DISTINCT * FROM wp_posts LEFT JOIN wp_post2cat ON (wp_posts.ID = wp_post2cat.post_id) WHERE 1=1 AND (category_id = 13) AND post_date_gmt <= ‘2005-06-27 22:48:59’ AND (post_status = “publish”) GROUP BY wp_posts.ID ORDER BY post_date DESC LIMIT 0, 99999999999999999999999999999999999999999

I haven’t altered any of the system’s code, and don’t actually know how to. I’d be very grateful of a solution to this problem. I’m afraid any solution will have to be told to me in layman’s terms as I’m inexperienced with complicated stuff like this. My webdesigner has deserted me.

Thanks for your time,
Tony.
http://www.rapnews.co.uk