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Ajax chat has crashed my site help please

  • Hi installed ajax chat on mu site http://www.minkeymusic.com and it will not let me in to the back end, so cannot un install, or do very little with it, can anyone recommend the best cause of action to take with this ?

    The ajax chat php file contains the following

    <?php
    /**
    * WordPress AJAX Process Execution.
    *
    * @package WordPress
    * @subpackage Administration
    *
    * @link http://codex.wordpress.org/AJAX_in_Plugins
    */

    /**
    * Executing AJAX process.
    *
    * @since 2.1.0
    */
    define( ‘DOING_AJAX’, true );
    define( ‘WP_ADMIN’, true );

    // Require an action parameter
    if ( empty( $_REQUEST[‘action’] ) )
    die( ‘0’ );

    /** Load WordPress Bootstrap */
    require_once( dirname( dirname( __FILE__ ) ) . ‘/wp-load.php’ );

    /** Load WordPress Administration APIs */
    require_once( ABSPATH . ‘wp-admin/includes/admin.php’ );

    /** Load Ajax Handlers for WordPress Core */
    require_once( ABSPATH . ‘wp-admin/includes/ajax-actions.php’ );

    @header( ‘Content-Type: text/html; charset=’ . get_option( ‘blog_charset’ ) );
    @header( ‘X-Robots-Tag: noindex’ );

    send_nosniff_header();

    do_action( ‘admin_init’ );

    $core_actions_get = array(
    ‘fetch-list’, ‘ajax-tag-search’, ‘wp-compression-test’, ‘imgedit-preview’, ‘oembed-cache’,
    ‘autocomplete-user’, ‘dashboard-widgets’, ‘logged-in’,
    );

    $core_actions_post = array(
    ‘oembed-cache’, ‘image-editor’, ‘delete-comment’, ‘delete-tag’, ‘delete-link’,
    ‘delete-meta’, ‘delete-post’, ‘trash-post’, ‘untrash-post’, ‘delete-page’, ‘dim-comment’,
    ‘add-link-category’, ‘add-tag’, ‘get-tagcloud’, ‘get-comments’, ‘replyto-comment’,
    ‘edit-comment’, ‘add-menu-item’, ‘add-meta’, ‘add-user’, ‘autosave’, ‘closed-postboxes’,
    ‘hidden-columns’, ‘update-welcome-panel’, ‘menu-get-metabox’, ‘wp-link-ajax’,
    ‘menu-locations-save’, ‘menu-quick-search’, ‘meta-box-order’, ‘get-permalink’,
    ‘sample-permalink’, ‘inline-save’, ‘inline-save-tax’, ‘find_posts’, ‘widgets-order’,
    ‘save-widget’, ‘set-post-thumbnail’, ‘date_format’, ‘time_format’, ‘wp-fullscreen-save-post’,
    ‘wp-remove-post-lock’, ‘dismiss-wp-pointer’, ‘upload-attachment’,
    );

    // Register core Ajax calls.
    if ( ! empty( $_GET[‘action’] ) && in_array( $_GET[‘action’], $core_actions_get ) )
    add_action( ‘wp_ajax_’ . $_GET[‘action’], ‘wp_ajax_’ . str_replace( ‘-‘, ‘_’, $_GET[‘action’] ), 1 );

    if ( ! empty( $_POST[‘action’] ) && in_array( $_POST[‘action’], $core_actions_post ) )
    add_action( ‘wp_ajax_’ . $_POST[‘action’], ‘wp_ajax_’ . str_replace( ‘-‘, ‘_’, $_POST[‘action’] ), 1 );

    add_action( ‘wp_ajax_nopriv_autosave’, ‘wp_ajax_nopriv_autosave’, 1 );

    if ( is_user_logged_in() )
    do_action( ‘wp_ajax_’ . $_REQUEST[‘action’] ); // Authenticated actions
    else
    do_action( ‘wp_ajax_nopriv_’ . $_REQUEST[‘action’] ); // Non-admin actions

    // Default status
    die( ‘0’ );

    I stupidly just installed it and activated it
    Any help appreciated

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