error when trying to run preparead on exchange 2010

In trying to diagnose an Exchange problem, I believe that adprep did run correctly when I installed Exchange 2010 SP3.  When I try to run it again using setup.com /preparead, it fails saying that a reboot is necessary from a previous installation, but no matter how many times I reboot the exchange server or the two domain controllers, I keep getting that message.  I assume there is a file or registry setting that makes it think it needs to reboot?  Is there a way to force it to continue or convince it otherwise?  Thanks! -Don
dongcamp100Asked:
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Simon Butler (Sembee)Connect With a Mentor ConsultantCommented:
The old reboot chestnut.
Follow this TechNet guide:

http://technet.microsoft.com/en-us/library/cc164360(v=exchg.80).aspx

It is for Exchange 2007, but applies to Exchange 2010.

Simon.
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dongcamp100Author Commented:
Quick and exactly what I needed!  Thanks!!
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