Need help installing vBulletin

Honestly you could have GOOGLED or eve YOUTUBED this and you would have gotten a shit ton of help and videos from youtube.
If you can't do that, You shouldn't be hosting a forum

If you want a good forum, use xenforo, best forum security.
VB has tons of exploits they won't fix until shit starts getting hacked.

As for installing, if you want help I'll help over Teamviewer, PMA is the easier part if you ask me :p