Comments (Database Error)

When i try to comment in my blog i got this:

WordPress database error: [Can’t open file: ‘wp_comments.MYD’. (errno: 145)]
SELECT comment_ID FROM wp_comments WHERE comment_post_ID = ‘203’ AND ( comment_author = ‘karlozrox’ OR comment_author_email = ‘karlozrox@gmail.com’ ) AND comment_content = ‘me la pelan’ LIMIT 1

Can somebody help me??

I dont know nothing about mysql =/