To install a domain controller into this Active Directory forest, you must first prepare the forest using 'adprep /forestprep'.
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Can you download adfind (link above)
run adfind -sc schver
47 = 2008 R2
44 = 2008
31 = W2K3 R2
30 = W2K3
I have a feeling you will be at 44 and need to use adprep from the 2008 R2 disk. If your current DC is 32 bit use adprep32 from the 2008 R2 media
Thanks
Mike