In this case you need to open fresh copy of the config.php file from your downloaded files and edit this file in editor like notepad or dreamweaver and change the following lines:
$config['base_url'] = " ";
// add http:yoursite.com/ between quotes
Line 324 to 328:
$config['hostname'] = "";
$config['db_username'] = "";
$config['db_password'] = "";
$config['db'] = "";
// Enter your database information.
If you still require our installation service order at http://www.zeescripts.com/store/php-script-installation-service.html
Then submit a ticket at http://www.zeescripts.com/store/support with the following info:
1. Domain name / folder: eg: www.yourdomain.com or www.yourdomain.com/folder
2. Hosting Control panel login url and credentials.
3. FTP login info - if other than cpanel hosting
4. Any other instructions.
Recommended Hostings : http://www.zeewebhosting.com