Error code: 0x57 running Adprep on Windows 200 server

I have a Windows 2000 SP4 Domain Controller and am trying to prepare the forest and domain for a new Windows Server 2008 R2 server which will become the domain controller.  When I run adprep32 /forestprep I am getting the following error:

"Adprep was unable to retrieve information from the local active directory domain controller
[User Action]
Verifiy that the local directory object exists and is accessible.
Adprep encountered a Win32 error.
Errror code: 0x547 Error message:  The parameter is incorrect."

This is the only DC in the environment so it holds all FSMO roles.
I have attached the adprep log file.

Thanks

 ADPrep.log
RickFerrAsked:
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brotaConnect With a Mentor Commented:
is the server pointing to any non Active directory dns servers?
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brotaCommented:
were you logged in as a Schema admin?
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RickFerrAuthor Commented:
Yes, I am logged in as the domain administrator who is a member of the schema admins group.
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RickFerrAuthor Commented:
Yes, actually, it is pointing to the router for DNS and to 4.2.2.2.
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brotaCommented:
do you have a underscore in your domain name or domain controller name?
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brotaCommented:
take the dns out and point to your AD dns only
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brotaCommented:
if you need an outside dns set up forwarders on your dns servers
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RickFerrAuthor Commented:
Ok, I will modify DNS settings and yes, there are two underscorse in the server name as well as the server name being 20 character long.  
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brotaConnect With a Mentor Commented:
most likely dns.
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RickFerrAuthor Commented:
Ok, after modifying DNS I get further but now end up with Adprep has been stopped.  The forest has not been completely prepared.  Error code 0x4c7: The operation was canceled by the user.
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brotaCommented:
I saw this online check these values they should be as follows

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\NTDS\Parameters
DWORD "Correct Missing Objects"=1
DWORD "Schema Delete Allowed"=0
DWORD "Schema Update Allowed"=0
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RickFerrAuthor Commented:
Ok, actually a mistake on my part.  I needed to hit "C" then "Enter" to continue with the adprep command.  Once I did that, adprep ran and successfully updated the forest info.  So the issue there was definitely DNS.  When I run adprep /domainprep I am getting the message that I must configure the domain to run in native mode.  Do you know if this change will impact users currently connected to the DC or impact any other functions currently running on the DC?
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brotaCommented:
as long as you dont have any NT domain controllers going to native mode should not affect anything.
I do not recall any user errors going to native mode.
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