Does your vBulletin 4 installation sit something like this?

domain.com/forum/forum.php and domain.com/forum/content.php ?

Would you prefer to have it more like we have it here, with the CMS at the domain root, and forum accessible at domain.com/forum/ ?

With vBSEO, now you can!

A 5 minute installation, and your forum will be enhanced with over 100 SEO improvements, including the much-needed "CMS in root" request.