Unzip your vbulletin2xx.zip file and upload everything from the upload folder to your website with an ftp program.
Point your webbrowser to
www.yoursite.com/forum/admin/install.php and follow the instructions carefully.
www.yoursite.com/forum being the palce you uploaded the forum to.
And if you are not sure if your webmaster deleted the database, you can check that after you uploaded the forums and then visiting your forum, if it shows anything resembling your old forum you don't have to run install.php but you should delete that single file.