hi,
open up config.php and look for
PHP Code:
/ Prefix that your vBulletin tables have in the database.
// For example: $tableprefix = 'vb3_';
$tableprefix = '';
if this setting is empty do not worry about it if it isn't then replace the "TABLE_PREFIX" with the setting you have in $tableprefix
note DO NOT EDIT THIS SETTING unless vbulletin tells you todo it your vbulletin installing will stop to work !