Database crashed, need help

[kartik786]

I'm getting the following error when posting any thread.

The homepage does not open,

Internal pages open fine, But when I open new thread, it gives a database error.

Database error in vBulletin 3.8.3:

Invalid SQL:

			SELECT thread.threadid, MATCH(thread.title) AGAINST ('testing') AS score
			FROM thread AS thread
			
			WHERE MATCH(thread.title) AGAINST ('testing')
				AND thread.open <> 10
				
				
			LIMIT 5;

MySQL Error   : Incorrect key file for table './database_name/thread.MYI'; try to repair it
Error Number  : 126
Request Date  : Saturday, July 30th 2011 @ 01:32:52 PM
Error Date    : Saturday, July 30th 2011 @ 01:32:54 PM
Script        : http://www.website.comforums/newthread.php?do=postthread&f=12
Referrer      : http://www.website.com/forums/newthread.php?do=newthread&f=12
IP Address    : 116.73.21.8
Username      : admin
Classname     : vB_Database_MySQLi
MySQL Version : 5.0.92-community-log

I repaired the database but this problem still remains the same.