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dcpromo - can't promote new 2008 R2 server to DC

I currently have 2 DC's, one is Server 2k8 (32-bit), the other is Server 2k8 - 64 bit.  I am ready to retire the 32-bit DC, so I installed another Server, 2K8 R2 and am trying to promote it.  When I do, I get the error that I must first run adprep /forestprep on the FSMO host.  But my Domain functional level is already 2008, so shouldn't the forest already be ready for another 2K8 DC?  I am hesitant to run adprep unless I am sure it's the correct move.   I could use some guidance here.  Thanks
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Mike Kline
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by the way you can quickly find your schema version using adfind from MVP Joe Richards

adfind -sc schver


Schema versions =
13 = windows 2000
30 = windows 2003
31 = windows 2003 R2
44 = windows 2008
47 = windows 2008 R2


Thanks
Mike
Server 2008 R2 is NOT the same as Server 2008 - you have to do what the message says and upgrade the Schema - there is a folder on the DVD with ADPREP...
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All FSMO roles are on the 64-bit DC.  Should I go ahead and run adprep /forestprep on that box?
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All FSMO roles are on the 64-bit DC.  Should I go ahead and run adprep /forestprep on that box?

-- yes
Schema is happily converting from 44 to 47.  I'm not clear - do I need to run adprep /domainprep /gpprep as well?
Thanks guys - much appreciated.