URLs not resolving

I have a blog that was running on WP 3.0.1. I wanted to change it to multisite, so I:

1) added the following to my wp-config.php

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

2) made other mods to the wp-config regarding keys and salts as requested
3) made edits to .htaccess file per instructions

WMPU appears to be working in that I can see the Network, etc through wp-admin and when I create a new blog, I see a new set of tables created in the DB. However, I can’t seem to access the newly created blog through it’s URL. For example, I tried to create wpmutest.lasherconsultingservices.com but the URL is not valid.

Can anyont help me? I’m guessing that it has something to do with my htaccess file settings. below is what is contained.

# BEGIN WordPress
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]
# END WordPress