instalacion de mediawiki con postgres

Señores,

Intento instalar mediawiki con postgres, pero me sale el siguiente error.
Checking the version of Postgres...FAILED. Required version is 8.1. You have
7.3 or earlier

Tengo instalado PostgreSQL Database Server 8.3,
Como puedo saber que las funciones de tsearch2 estan correctamente
instaladas.

Como siempre muchas gracias por la ayuda que me puedan prestar.

Att
Luis Alfonso Cañas

MediaWiki 1.14.0 Installation

* Don't forget security updates! Keep an eye on the low-traffic release
announcements mailing list.

Checking environment...

Please include all of the lines below when reporting installation problems.

* PHP 5.2.5 installed
* Found database drivers for: PostgreSQL
* PHP server API is apache2handler; ok, using pretty URLs
(index.php/Page_Title)
* Have XML / Latin1-UTF-8 conversion support.
* Session save path (C:\DOCUME~1\lucho\CONFIG~1\Temp\php\session)
appears to be valid.
* PHP's memory_limit is 128M.
* Couldn't find Turck MMCache, eAccelerator, APC or XCache; cannot use
these for object caching.
* GNU diff3 not found.
* Couldn't find GD library or ImageMagick; image thumbnailing disabled.
* Installation directory: C:\Archivos de programa\Apache Software
Foundation\Apache2.2\htdocs\mediawiki
* Script URI path: /mediawiki
* Installing MediaWiki with php file extensions
* Environment checked. You can install MediaWiki.
* Warning: $wgSecretKey key is insecure, generated with mt_rand().
Consider changing it manually.
*

Generating configuration file...
* Database type: PostgreSQL
* Loading class: DatabasePostgres
* Attempting to connect to database "postgres" as superuser
"postgres"...
* Checking the version of Postgres...FAILED. Required version is 8.1.
You have 7.3 or earlier