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Hi,
Regarding your request, maybe the following articles could help.
Guide for Upgrading to Windows Server 2008
http://technet.microsoft.com/en-us/library/cc755199(v=ws.10).aspx
Upgrading an Active Directory Domain from Windows Server 2003 to Windows Server 2008 or Windows Server 2008 R2
http://msmvps.com/blogs/mweber/archive/2010/02/10/upgrading-an-active-directory-domain-from-windows-server-2003-to-windows-server-2008-or-windows-server-2008-r2.aspx
Hope this helps.
Best Regards,
Andy Qi
Andy Qi TechNet Community Support
Please follow the link below (It has screen shoot you can follow )
http://www.trainsignal.com/blog/upgrading-to-server-2008-from-server-2003