UPgrade from windows server 2003 to windows server 2008 error

I am trying to upgrade a windows server 2003 standard to windows server 2008 standard and have the cd for the install (it is the one that came with the server when I originally bought).    This is a domain controller in a small windows environment. I get to a point where there is an error upgrade to this build have been disabled.  Try to upgrade to a more recent build.  Any suggestions?
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Radhakrishnan RSenior Technical LeadCommented:

This could be the media which you are trying to install. If you have another 2008 OS DVD then try with that.
Kash2nd Line EngineerCommented:
try different media.
Also, I would make sure there is a good backup in place before upgrading in case something goes wrong.
manch03Author Commented:
I did a system state back up - do I need to do anything more?
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Henrik JohanssonSystems engineerCommented:
Are you trying to upgrade from 32 bit to 64 bit? If so, you're required to reinstall it. As it's a DC, add another temporary DC during reinstall and later decommission the temporary DC when the reinstall of the DC is complete.
manch03Author Commented:
I am not trying to go from 32 bit to 64 bit - 32 to 32 bit.  I have added another DC - I have everything running on it except dhcp (only one dhcp server at a time right?).  I do not want to reinstall.  I want to upgrade.  If I cannot do that, then I will figure something else out.
Henrik JohanssonSystems engineerCommented:
2003standqarqd32 to 2008standard32 should work for just OS installation. I have no memory of doing upgrade of DC in other way than adding new DC and decomission the old. Even if it might work to upgrade a DC, it's safer to go with the stepstone of replicating the data to another server to avoid corruption between different OS versions. Make sure you prepare AD schema with adprep/forestprep and adprep/domainprep before promoting the newer OS as DC.

You can have multiple DHCP servers handling same scope, but you don't have the full failover functionality as you haven't moved up to 2012R2.
If having multiple DHCP servers, the one that responds first will give the lease. If doing so, make sure you should configure the two servers handle different subparts of scope (split 50/50 or 80/20 etc as long they don't overlap) to prevent the lease of same IP to two different clients. DHCP database can be migrated.
Steps for migrating DHCP database: https://support.microsoft.com/en-us/kb/962355

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manch03Author Commented:
I apologize. I have not been back to try this - I will work on this again this week and will test to see if any of the solutions work.
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Windows Server 2008

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