First please check your Appserv or Apache or ISS or other web server before you run

1. If you Use IIs or PWS :- you can set it Inetpub/root
http://Inetpub/root
2. If you Use Appserv you can set it to localhost in your IE to test it.
http://localhost/ test.php

file test.php

<?php
phpinfo (): ?> Try to do it.