You are not entering the correct table prefix for your vbulletin tables I would assume
Your cookie prefix would be bb
You can find out the proper information looking at your vbulletin confg.php file located in the
vb includes directory.
I do beleive we went over this via email when you asked the same thing via email. If you input all the proper information you should be successful.
I entered the table prefix as empty as you have not defined one and moved the cookie prefix where it is suppose to be and your install is fine
http://www.lcbolo.com/classifieds/