WampServer

I've created a form but when I click the send button to direct it into a PHP file,it does not.Instead, a message box said that "Do You want to download this file?" everytime I click the button. I've already activated my wampserver and placed all my files into the www directory...What maybe the solution?

do not access your website file in your web browser like this
c:\wamp\www\somefile.php

use
[localhost]