ADprep for 2008 server R2

I have a 2003 domain controller and now a new 2008 server. I'm trying to create a 2008 domain controller in my existing forest.  I know I have to run adprep.  However, it's not letting me run forest prep? If I run on 2008 server it tells me Can't run on this platform because it's no an AD domain controller.  If I try to run on 2003 it tells me it's not vaild on this machine?  How do I accomplish this? I have a 2008 r2 64 bit server and a 2003 32 bit server?
WellingtonISAsked:
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Mike KlineCommented:
Use adprep32 from your 2008 R2 CD on the 2003 server

forestpreo should be run in the schema master

domainprep on your infrastructure master

Thanks

Mike
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WellingtonISAuthor Commented:
I just found that... Also, adprep32 /domainprep or /domainprep /gpprep?
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Mike KlineCommented:
yes run those, when you are done you will be at schema version 47

http://adisfun.blogspot.com/2013/06/windows-server-2012-r2-preview-schema.html

Thanks

Mike
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WellingtonISAuthor Commented:
Thanks.  I forgot about the 32 prep.
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Windows Server 2008

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