Have you considered upgrading? You are running MediaWiki 1.12 which was released in early 2008. MediaWiki only supports 1.19 (released in 2012) and above and 1.21 is current (though you can't go any higher than 1.19 without upgrading your php). Upgrading is really very simple.
Also, you seem to have installed your wiki at /wiki, resulting in an inability to properly configure short urls. '/wiki/index.php/Foo' is not a standard MediaWiki url, rather it should be '/w/index.php/Foo' which is then shortened to '/wiki/Foo'.
Doug
MeritBadge.Net
The Scouting Discussion Network