install and delete

I’m a newbie, and try to install a wp site. When I delete the version I installed, I delete it by click the “remove”. So I think I have removed the old one, I try to install a new version, when I click “install”, the massege come out:Install WordPress (2/3)

The installation can not be completed:

– You chose to install in the main directory of the domain treatmentforhemorrhoidinfo.com, but there are conflicting filenames, therefore we can not proceed. Following filenames already exist in the main directory of the domain treatmentforhemorrhoidinfo.com (path=”/home/xc08401/public_html/”).You must manually remove these files before proceeding with auto-installation:
wp-admin
wp-content
wp-includes
fantversion.php
index.php
license.txt
readme.html
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-cron.php
wp-feed.php
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-trackback.php
xmlrpc.php

Click on the browser’s Back button to fix reported error”

Can anyone can tell me what shall I do?
Thanks.