My site will indexes the www instead of no-www

Hello,

How do I change my domain to show as 'any_domain.com' instead of 'www.any_domain.com' when searching in MSN?

I did a search for 'palconit' and found my site listed as 'www.any_domain.com'. I already made the necessary 301 redirect htaccess on my site because I don't want to see it as 'www.any_domain.com' on search results. What do I have to do to change my search result from 'www.any_domain.com' to appear as 'any_domain.com'?

Thanks,

Alfredo