Need some help with Database Errors and how to fix

[TimBrown]

Hi, my vB has some kind of database error and i dont know how to fix it. Heres the error

<!--
Database error in vBulletin 3.7.3:

Invalid SQL:

		SELECT 
			userfield.*, usertextfield.*, user.*, UNIX_TIMESTAMP(passworddate) AS passworddate,
			IF(displaygroupid=0, user.usergroupid, displaygroupid) AS displaygroupid,
			language.phrasegroup_global AS phrasegroup_global,
			language.phrasegroup_holiday AS phrasegroup_holiday,
			language.options AS lang_options,
			language.languagecode AS lang_code,
			language.charset AS lang_charset,
			language.locale AS lang_locale,
			language.imagesoverride AS lang_imagesoverride,
			language.dateoverride AS lang_dateoverride,
			language.timeoverride AS lang_timeoverride,
			language.registereddateoverride AS lang_registereddateoverride,
			language.calformat1override AS lang_calformat1override,
			language.calformat2override AS lang_calformat2override,
			language.logdateoverride AS lang_logdateoverride,
			language.decimalsep AS lang_decimalsep,
			language.thousandsep AS lang_thousandsep
			
		FROM vb_user AS user
		LEFT JOIN vb_userfield AS userfield ON (user.userid = userfield.userid)
		LEFT JOIN vb_usertextfield AS usertextfield ON (usertextfield.userid = user.userid) LEFT JOIN vb_language AS language ON (language.languageid = IF(user.languageid = 0, 1, user.languageid)) 
		
		WHERE user.userid = 6;

MySQL Error   : Table './x4wrest_forum/vb_user' is marked as crashed and should be repaired
Error Number  : 145
Request Date  : Monday, April 6th 2009 @ 02:03:18 PM
Error Date    : Monday, April 6th 2009 @ 02:03:18 PM
Script        : http://24forums.com/
Referrer      : http://24forums.com/
IP Address    : 216.138.1.10
Username      : 
Classname     : vB_Database
MySQL Version : 
-->

Any idea on what to do?
Please and thank you!