Hi, it looks like your web server setup prioritises html over php files. If you have access to your Apache's httpd.conf (or IIS configuration if you have Windows hosting) you need to change it there, I believe (I don't know exactly where - at least it will point you in some direction). I think Drupal's .htaccess will by default have this correctly configured, which makes me think that your host doesn't allow local .htaccess files. Perhaps it's a good thing to ask your host to look into this?
Regards,
Kobus