Cron Backup Script Pls...

[xTerMn8R]

Can any one guide me as to How I'd create a script to backup 1 MySQL database using Vbulletin's Scheduler? I use windows 2000 server and vb3.03 I'vetried using this ./includes/cron/backup.php file below, which works fine (the commands) if I telnet and run them from the command line, but doesnt seem to work right using a cron Scheduler, It creates the file but zero Bytes.

<?php 
exec ('mysqldump --add-drop-table -u**** -p**** ctcforum >w:\vBackups\test.sql');
?>

Thanks ...
Peace...