Why does my site look like this?

My website looks like this:

Index of /

license.txt
readme.html
stats/
wp-activate.php
wp-admin/
wp-app.php
wp-atom.php
wp-blog-header.php
wp-comments-post.php
wp-commentsrss2.php
wp-config-sample.php
wp-config.php
wp-content/
wp-cron.php
wp-feed.php
wp-includes/
wp-links-opml.php
wp-load.php
wp-login.php
wp-mail.php
wp-pass.php
wp-rdf.php
wp-register.php
wp-rss.php
wp-rss2.php
wp-settings.php
wp-signup.php
wp-trackback.php
xmlrpc.php

Can anyone tell me why this is and what I need to change??