Database error güncellemede

Database error in vBulletin 3.7.3:

Invalid SQL:

		SELECT prefix.*, prefixpermission.usergroupid AS restriction
		FROM prefix AS prefix
		LEFT JOIN prefixpermission AS prefixpermission ON (prefix.prefixid = prefixpermission.prefixid)
		ORDER BY prefix.displayorder;

MySQL Error   : Illegal mix of collations (latin1_swedish_ci,IMPLICIT) and (latin5_turkish_ci,IMPLICIT) for operation '='
Error Number  : 1267
Request Date  : Tuesday, February 10th 2009 @ 10:45:58 PM
Error Date    : Tuesday, February 10th 2009 @ 10:45:59 PM
Script        : http://www.snotmop.com/install/upgrade_380a2.php?step=5
Referrer      : http://www.snotmop.com/install/upgrade_380a2.php?step=4
IP Address    : 85.110.235.216
Username      : 
Classname     : vB_Database
MySQL Version : 4.1.22-standard