If you are using an apache server, insert this into your .htaccess file:
Code:
RewriteEngine On
RewriteCond %{HTTP_HOST} ^example.com
RewriteRule (.*) http://www.example.com/$1 [R=301,L]
Replace example.com with your domain. This will redirect non www to the www version. reverse it if you want to show only the non www version.
xxhttp://www.stepforth.com/resources/web-marketing-knowledgebase/non-www-redirect/ Explains it all and how to do the redirect if you are on a Microsoft server.
You should also specify in Google WMT what version you want. Just verify both the www and non www, then pick one and after that remove the version you do not want from webmaster tools.
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"People who are unable to motivate themselves must be content with mediocrity." ~Andrew Carnegie~