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I'm in an odd situatuion here,

I've upgraded my network to a 2008 domain from a 2003 with out any issue, this works fine and all the FSMO are in one DC,

I was about to install a second domain on a 2008R2 and this error is coming up again and again.

I The problem is I keep getting an area telling me that I need to run adprep /domainPrep /forestPrep, but when I run it on the First DC, it tells me this has already been run and updated and it is aborted. Does anyone have any ideas on why I can't add a Server 2008 machine as a domain controller?

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migrated from superuser.com Sep 3 '10 at 21:15

This question came from our site for computer enthusiasts and power users.

marked as duplicate by HopelessN00b, Ward, yagmoth555, bangal, mdpc Mar 10 at 15:39

This question was marked as an exact duplicate of an existing question.

Are you running adprep from the R2 DVD on the older 2008 system? R2 has its own active directory modifications.

If your older DC is a 32 bit system you will need to run the 32 bit adprep rather than the 64 bit one.

Ian

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