.htaccess:
RewriteEngine On
RewriteBase /
RewriteCond %{HTTP_HOST} ^www\.(.*)$ [NC]
RewriteRule ^(.*)$ http://%1/$1 [R=301,L]
This will make whatever comes from
Domain Name Registration and Web Hosting | Domain.com , go to: domain.com (without www)
Probably updating your permalinks will help... Just go to the page, and click Save.