Cant create a new domain in my windows 2003 network

When I try to create either a child domain or a separate domain (new) I get the error message that says...........

"The forest is not prepared for installing windows 2003. Use the Adprep command line tool to prepare both the domain and the forest. The version of Active Directory Schema of the source forest is not compatible with the version of active directory on this computer "

My current domain is windows 2003  - R2 has not been added. The server I am trying to make a domain controller on inside a new separate domain is Windows Server 2003 Enterprise Edition Service Pack 1 (build 3790)
tmccabeAsked:
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Netman66Connect With a Mentor Commented:
If this is a new server then it's likely R2.  Hit CTRL+ALT+DEL on that server and read the top of the logon box.

If it's already R2 then run Adprep /forestprep and adprep /gpprep on the existing root DC from the second CD of R2 - \COMPNENTS\R2\ADPREP.

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