This post will show the proper use of ADPREP and what to expect when you are running it. ADPREP is broken down into four stages with Windows Server 2008, instead of the two that most of you may be familiar with when you upgraded to Windows Server 2003. The four steps include Forest Preparation, Domain Preparation, Group Policy Preparation. Feb 22, 2011 Windows Server 2008 R2 builds on the award-winning foundation of Windows Server 2008, expanding existing technology and adding new features to enable organizations to increase the reliability and flexibility of their server infrastructures. Sep 15, 2015 Windows Server 2008 R2 SP1 Install Instructions To start the download, click the Download button and then do one of the following, or select another language from Change Language and then click Change.
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To do forest related tasks you may be looking for the Enterprise Admins group. That is the group required for adprep /forestprep.Running the Schema upgrade requires all three admin groups in the domain, per info from the source link.Make sure that you can log on to the schema master with an account that has sufficient credentials to run adprep /forestprep. You must be a member of the Schema Admins group, the Enterprise Admins group, and the Domain Admins group of the domain that hosts the schema master, which is, by default, the forest root domain.It is also best practices to remove yourself from this group when you are done with the required tasks. As a Domain Admin, you have rights to add and remove yourself. The same goes for the Schema Admins group.Source:Credit to JBaldridge for catching a couple mistakes. We don't really know all that much about your environment. How many domains do you have in your forest?
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Are you working in the root forest domain or a child domain? The error specifically calls out ADPrep. You need to run adprep /forestprep on the schema operations master for the forest so that you can see the output and deal with any errors from there. Make sure to login as an admin that already is a member of Enterprise Admins. This should solve the issue (or at least get you much closer).–May 2 '17 at 16:08.