Database Error – Pls. Help

Hello,
I just launched a business Blog (www.ForoMX.com) a week ago, and I wonder if you could help me figure out how to resolve this problem.

I just vistited my site, and found out that I received the following ERROR Messages:

“WordPress database error: [Got error 12 from storage engine]
SELECT DISTINCT post_id, cat_ID FROM wp_categories, wp_post2cat WHERE category_id = cat_ID AND post_id IN (24)”

and another type of ERROR Message:
“WordPress database error: [Got error 12 from storage engine]
SELECT DISTINCT YEAR(post_date) AS year, MONTH(post_date) AS month, count(ID) as posts FROM wp_posts WHERE post_date < ‘2006-03-31 00:57:58’ AND post_status = ‘publish’ GROUP BY YEAR(post_date), MONTH(post_date) ORDER BY post_date DESC

Could you pls. help me figure out how to resolve this matter?.