Can not access Sharepoint site on domain member computer from external through IE

We recently set up a new intranet site using Sharepoint 2010.  Set up a forward to redirect the old intranet URL to the sharepoint site.  Set up policies to set IE settings to allow credentials from the account logged into the local computer to not have to log into the site.  Everything works perfect on domain member computers that are connected to the domain.  Everything works fine on non-domain member computers, the site comes up and prompts for a login.  
The problem is when the domain member computers are not connected to the domain.  When that is the case if the site is accessed through IE it goes to a blank white page.  If, on the same computer the site is accessed through Firefox or another browser the site prompts for login and then works fine.
We were pushed to set the site up in Sharepoint way before we were ready so we have very limited knowledge and experience in Sharepoint.  Have researched this and found several suggestions, mostly tweaks to IIS or IE settings, which have not worked.
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mhequipitMH IT DeptAsked:
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Michael CarrilloInformation Systems ManagerCommented:
Since it appears to work with FireFox and other non-IE browser, it sounds as if the problem may be with IE.
First thing I would do is run Windows update on the computers that are having the problems to ensure that both Windows and Office are fully updated.

What version of IE are you using?
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mhequipitMH IT DeptAuthor Commented:
Most of the computers with the issue are Windows 7 Enterprise, some are XP SP3 still.  I believe the issue occurs on both IE8 and IE9.
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livanescuCommented:
Check the Local Intranet and Trusted Sites security zones in IE and make sure the choice is set to "Automatic logon only in Intranet zone" - last opti+on in Custom settings
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