What's wrong with my Exchange Server 2003 installation?

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http://serverfault.com – In a testing environment, I have a windows server 2008 Standard that functions as a domain controller for the domain MyDomain.com. I have another similar machine that is a domain controller of a child domain named MyChild.Mydomain.com. I'm trying to install Exchange Server 2003 on a third machine that is running Windows Server 2003 R2 Standard Edition that is joined to the parent domain MyDomain.com, and on a fourth machine (also Exchange Server 2003 on Windows server 2003 R2 Standard Edition) that is joined to the child domain MyChild.MyDomain.com. Both servers (that will host the Exchange Se (HowTos)