Thread:Project:Support desk/Can't start just installed media wiki/reply

A white page usually means that some kind of PHP error is happening. Enable PHP's error reporting to see what is going on.

To me it is not quite clear at which step of installation you are exactly, but I think it might be OK that only the installer in mw-config/index.php is loading. Before you can run MediaWiki you first have to create a file called LocalSettings.php. Go through that installer; it will create that file for you and tell you everything you need to do to get MediaWiki running.

Btw another hint: Usually people use Apache as webserver, not IIS. This does not mean it won't work with IIS, but it means that things are tested much more with Apache and that you are likely to have less problems and more support from others when you are using Apache than IIS. If you have not already installed many things with IIS, I would recommend you try XAMPP, which is a package bringing you Apache, PHP and MySQL, all in one, preconfigured and ready to use.