multisite problem

I have tried a number of things. This is the first network I am setting up.

I followed the instructions to a T and keep getting a few different problems.

When I replaced the .htaccess with this.

# BEGIN WordPress
<IfModule mod_rewrite.c>
RewriteEngine On
RewriteBase /
RewriteRule ^index\.php$ - [L]
# uploaded files
RewriteRule ^files/(.+) wp-includes/ms-files.php?file=$1 [L]
RewriteCond %{REQUEST_FILENAME} -f [OR]
RewriteCond %{REQUEST_FILENAME} -d
RewriteRule ^ - [L]
RewriteRule . index.php [L]
</IfModule>
# END WordPress

I received a 500 internal server error and when I change back to the original backup file it works.

The changes made to the wp-config was this:

*/
define('WP_DEBUG', false);
define('WP_ALLOW_MULTISITE', true);
define('MULTISITE', true);
define('SUBDOMAIN_INSTALL', true);
$base = '/';
define('DOMAIN_CURRENT_SITE', 'salsclub.com');
define('PATH_CURRENT_SITE', '/');
define('SITE_ID_CURRENT_SITE', 1);
define('BLOG_ID_CURRENT_SITE', 1);

/* That's all, stop editing! Happy blogging. */

/** Absolute path to the WordPress directory. */
if ( !defined('ABSPATH') )
	define('ABSPATH', dirname(__FILE__) . '/');

/** Sets up WordPress vars and included files. */
require_once(ABSPATH . 'wp-settings.php');

But it will not go to demo.salsclub.com I get this error for created site.

Server not found

Firefox can’t find the server at demo.salsclub.com.
Check the address for typing errors such as
ww.example.com instead of
http://www.example.com
If you are unable to load any pages, check your computer’s network
connection.
If your computer or network is protected by a firewall or proxy, make sure
that Firefox is permitted to access the Web.

I tried two different installations with the exact same results.

I saw a article that was written about this code:

define('DB_CHARSET', 'utf8');

/** The Database Collate type. Don't change this if in doubt. */
define('DB_COLLATE', '');

On person said to define the DB_COLLATE Is that why I am having the same problem.

I appreciate any input for this very much thanks in advance.

Sal