Thread:Project:Support desk/Rolling back entire site

MediaWiki: Unknown, my Special:Version page no longer exists (Per my hosting site it appears to be 1.17.0) PHP: 5.2.17 Database: MySQL 5.1.61-community-log

URL: http://www.military-power.net/Wiki/

My site has been extremely vandalized. I am unsure as to how as I had supposedly blocked anonymous users from being able to edit anything, yet they are, in force. Is there a way to roll back the entire site to a specific point (before the vandalization happened?