install wont run

After i upload and set permissions how I do everytime I install wordpress, when I go to the domain to start the install, it attempts to download a file called ‘download’ with the following contents:

Its as if it turns my domain into a redirect to download this file.

<?php
/**
 * Front to the WordPress application. This file doesn't do anything, but loads
 * wp-blog-header.php which does and tells WordPress to load the theme.
 *
 * @package WordPress
 */

/**
 * Tells WordPress to load the WordPress theme and output it.
 *
 * @var bool
 */
define('WP_USE_THEMES', true);

/** Loads the WordPress Environment and Template */
require('./wp-blog-header.php');
?>