Database error – any thoughts?

Hello,

2 days ago my blog was fine, and now today its throwing an error:

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WordPress database error: [Got error 28 from table handler]
SELECT * FROM wp_posts WHERE 1=1 AND YEAR(post_date)=’2006′ AND MONTH(post_date)=’7′ AND DAYOFMONTH(post_date)=’5′ AND post_name = ‘artthailand-art-thailand-life-death-3’ AND (post_status != “static”) AND post_status != “attachment” GROUP BY wp_posts.ID ORDER BY post_date DESC

Warning: session_start(): Cannot send session cookie – headers already sent by (output started at /home/artthai/public_html/blog/wp-includes/wp-db.php:102) in /home/artthai/public_html/blog/wp-content/themes/artThailand/home.php on line 2

Warning: session_start(): Cannot send session cache limiter – headers already sent (output started at /home/artthai/public_html/blog/wp-includes/wp-db.php:102) in /home/artthai/public_html/blog/wp-content/themes/artThailand/home.php on line 2

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Can anyone help me on what this might be and how to possible fix it?

Any thoughts would be great

Rob