Could be a SSL configuration problem or file dropping from your file manager. I see it's a fresh install, but an older version. I would suggest a clean install of v1.3.5 .
I don't have much experience with SSL or configuration problems, I guess I've been lucky. So, the best I could do is point you to a guide by the Zen Cart team for another issue, but relating to configuration problems.
This has to do with your configure.php file settings located in your store/includes folder.
If you choose to post the contents for easier investigation, please remember to remove your database, username, and password from the contents before posting.
I was just thinking...how long ago do you get the SSL certificate? It actually may take time for that to get operational, depending on the certificate provider. Other than that, the best thing to do is post your contents of configure.php(located in the main includes folder, without your username/password, so we can take a look at your SSL settings in the mean time. Open up the file with your favorite editor like Notepad or Wordpad, copy and paste the contents in your post, omitting your database name/password(extremely, extremely important).
<?php
/**
*
* @package Configuration Settings
* @copyright Copyright 2003-2006 Zen Cart Development Team
* @copyright Portions Copyright 2003 osCommerce
* @license <http://www.zen-cart.com/license/2_0.txt> GNU Public License V2.0
*/
// Define the webserver and path parameters
// HTTP_SERVER is your Main webserver: eg, <http://www.yourdomain.com>
// HTTPS_SERVER is your Secure webserver: eg, <https://www.yourdomain.com>
define('HTTP_SERVER', 'http://www.acuhealthzone.com');
define('HTTPS_SERVER', 'https://www.acuhealthzone.com');
// Use secure webserver for checkout procedure?
define('ENABLE_SSL', 'true');
// NOTE: be sure to leave the trailing '/' at the end of these lines if you make changes!
// * DIR_WS_* = Webserver directories (virtual/URL)
// these paths are relative to top of your webspace ... (ie: under the public_html or httpdocs folder)
define('DIR_WS_CATALOG', '/products/');
define('DIR_WS_HTTPS_CATALOG', '/products/');
define('DIR_WS_IMAGES', 'images/');
define('DIR_WS_INCLUDES', 'includes/');
define('DIR_WS_FUNCTIONS', DIR_WS_INCLUDES . 'functions/');
define('DIR_WS_CLASSES', DIR_WS_INCLUDES . 'classes/');
define('DIR_WS_MODULES', DIR_WS_INCLUDES . 'modules/');
define('DIR_WS_LANGUAGES', DIR_WS_INCLUDES . 'languages/');
define('DIR_WS_DOWNLOAD_PUBLIC', DIR_WS_CATALOG . 'pub/');
define('DIR_WS_TEMPLATES', DIR_WS_INCLUDES . 'templates/');
define('DIR_WS_PHPBB', '/');
// * DIR_FS_* = Filesystem directories (local/physical)
//the following path is a COMPLETE path to your Zen Cart files. eg: /var/www/vhost/accountname/public_html/store/
define('DIR_FS_CATALOG', '/home/trendz/acuhealthzone.com/products/');
define('DIR_FS_DOWNLOAD', DIR_FS_CATALOG . 'download/');
define('DIR_FS_DOWNLOAD_PUBLIC', DIR_FS_CATALOG . 'pub/');
define('DIR_WS_UPLOADS', DIR_WS_IMAGES . 'uploads/');
define('DIR_FS_UPLOADS', DIR_FS_CATALOG . DIR_WS_UPLOADS);
define('DIR_FS_EMAIL_TEMPLATES', DIR_FS_CATALOG . 'email/');
// define our database connection
define('DB_TYPE', 'mysql');
define('DB_PREFIX', 'zen_');
define('DB_SERVER', 'product.acuhealthzone.com'); // eg, localhost - should not be empty
define('DB_SERVER_USERNAME', '*************');
define('DB_SERVER_PASSWORD', '******');
define('DB_DATABASE', 'acuhealthzone');
define('USE_PCONNECT', 'false'); // use persistent connections?
define('STORE_SESSIONS', 'db'); // leave empty '' for default handler or set to 'db'
// The next 2 "defines" are for SQL cache support.
// For SQL_CACHE_METHOD, you can select from: none, database, or file
// If you choose "file", then you need to set the DIR_FS_SQL_CACHE to a directory where your apache
// or webserver user has write privileges (chmod 666 or 777). We recommend using the "cache" folder inside the Zen Cart folder
// ie: /path/to/your/webspace/public_html/zen/cache -- leave no trailing slash
define('SQL_CACHE_METHOD', 'database');
define('DIR_FS_SQL_CACHE', '/home/trendz/acuhealthzone.com/products/cache');
?>
Is directing to the https area you have, however, you don't have that
set up yet.
You can A) reset everything ,and leave off the https part, or just
set
that up using the panel. You can use the self signed certificate we
offer, or, buy one on your own.
Hope this helps! If you need anything else, please let us know.