Install or Upgrade?

[Zarxrax]

I was recently having some issues with hacking on my forum, so I ultimately had my web server totally wiped clean, and I'm about to install the latest vb4.

I was previously running 3.8.5, and I downloaded the database backup.
What exactly do I need to do to get things up and running again?
I'm assuming that I should first of all restore my database before installing the forum.
So after that, would I perform an upgrade or an install?

[ShiningStar]

If you wish to upgrade then no need to install,
Just import your previous Database from PHPMYADMIN to newly created Database,
Fill config.php & run an upgradation i.e.
www.domain.com/install/upgrade.php
Plus: CHMOD "config.php" to 400 to avoid being Defaced.