Have you checked the config.php files to make sure that they are pointing to the correct file path?
Here are a couple of the areas that need to be correct in your admin/includes/config.php file. I also moved to a different server and the file path as well as the sql server info must change in your config files. As for your includes/config.php (keep them separate) the file paths in this must also change.
define('HTTP_SERVER', 'https://www.mystore.org');
define('HTTPS_SERVER', 'https://www.mystore.org');
define('HTTP_CATALOG_SERVER', 'https://www.mystore.org');
define('HTTPS_CATALOG_SERVER', 'https://www.mystore.org');
// Use secure webserver for catalog module and/or admin areas?
define('ENABLE_SSL_CATALOG', 'true');
define('ENABLE_SSL_ADMIN', 'true');
This is the path to your Zen cart files. Your web host can help with this.
// * 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/
Hope this helps.