Got error, need help

I just logged in to manage my blog, but when I view my blog the sidebar that contain blogroll widgets saying:

WordPress database error: [Got error 28 from storage engine]
SELECT * , IF (DATE_ADD(link_updated, INTERVAL 120 MINUTE) >= NOW(), 1,0) as recently_updated FROM wp_links LEFT JOIN wp_link2cat ON (wp_links.link_id = wp_link2cat.link_id) WHERE 1=1 AND link_visible = ‘Y’ AND ( category_id = 2 ) ORDER BY link_name ASC

I got the same error when browsing my blog through the category. My friend blog also had the same error on her WordPress version 2.2 Blog

Please help me.