Database error: [Got error 28 from table handler]

Blog worked fine for months, suddelny this when trying to see the index.php:
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Database error: [Got error 28 from table handler]
SELECT DISTINCT * FROM wp_posts WHERE 1=1 AND post_date_gmt <= ‘2004-12-18 17:54:59’ AND (post_status = “publish”) GROUP BY wp_posts.ID ORDER BY post_date
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What’s going on? I hope there’s an easy fix for this. I have 2 MySQL databases, one for the blog, one for my gallery, both check out fine in my webhosts’ cpanel. No clue where to start!