website does not load without www

Some browsers (and sometime behavior changes from version to version) add www automatically to the URL the users type in the address text box. For those that don't, the solution is adding *.domain.com to the DNS.

You could also add a redirect rule to redirect all non wwwrequests to www

http://kb.siteground.com/how_to_redirect_nonwww_urls_to_www/

And to expand on that comment, on some browsers, I don't have to add ".com".  I can type "google" or "cisco" in the address bar and the browser will automatically fill out the rest.

Strivoli,
I already have (* (All Others)       7200       204.100.163.112 ) on my DNS with the registra. and it does not work.
Monty,
the website is hosted off premise.

what you need is a ServerAlias directive in your web server configuration for that domain and make sure that www.domain.com and domain.com both point to the same address in DNS.

I don't know IIS, but that is the term in Apache.

You have a 301 redirect set up on your server.  If you add c-m-p.com to the address bar, your site redirects to www.

What you are describing sounds like you are using a search bar to add the web address and this is common.   What browser are you using?

I think it's browser related as well.  I use FireFox and I don't have that issue.  The problem occurs with IE.

I will check with the end user.