WP_Comments Error?

Both before and after I updated to v2.3, I’ve been getting an error across my wp-admin page that I’d love to get rid of. The error, which appears littered throughout the pages, is as follows:

WordPress database error: [Can’t open file: ‘wp_comments.MYI’ (errno: 145)]
SELECT COUNT(*) FROM wp_comments WHERE comment_approved = ‘0’

Any help in tracking down the cause and eliminating it would be much appreciated.