Are you integrating with nuke or vbulletin here?
If your integrating with vbulletin you need to in the first step of install specify the proper database info for vbulletin in user database spot. You need to input the correct vbulletin license number. On the forth step of install you input the proper table prefix if any and cookie prefix( your cookie prefix on a default
vb is bb) and complete the install with all the paths correct.