Site loads as a .php file

After installing the plug in and trying to resolve the error with not displaying the site description in search, my site would not longer load, but instead generate a .php file with the following text:
<?php
/**
* Front to the WordPress application. This file doesn’t do anything, but loads
* wp-blog-header.php which does and tells WordPress to load the theme.
*
* @package WordPress
*/

/**
* Tells WordPress to load the WordPress theme and output it.
*
* @var bool
*/
define(‘WP_USE_THEMES’, true);

/** Loads the WordPress Environment and Template */
require( dirname( __FILE__ ) . ‘/wp-blog-header.php’ );

I tried going back and disabling the All in One SEO plugin but no plug ins were visible.
Wordpress told me that the site can’t be reached and gave me an option to disconnect. I disconnected and when I tried to connect again using JetPack, it shows that my log in credentials are incorrect. I double checked the user name and changed the password and still cannot log in.
How can I bring my site back?

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