Exchange 2003 installation fails at 5.5 service account creditials

When installing MS Exchange 2003 on a Windows 2003 server, the deployment tools all run clean.  During the MS exchange 2003 installation wizard the installation does not proceed past the entering of the password for the Exchange 5.5. service creditials.  The Domain name and user name are greyed out and only the password you can enter.  I enter the password for the MS 5.5 service accounts, which is DomainName\Administrator.  But the error occurs:  " The accountmust be valid before continuing"  This is the password for the Exchange 5.5 services.  Is there any way to rectify this error so I can validate and continue the install?
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amullee44Author Commented:
My previous questions were answered by either myself or not at all.  I haven't received a B or A answer to the 2 questions posted.  I will keep that in mind though if I do happen to recieve an adeqate response to a question.  Seems as if the initial responses are just "icing" with those responders wanting the quick points, when I was hoping otherwise...  Also, once I had responded that the steps already taken that they had suggested, then nothing, once again, "icing". I can grade A all the time if you wish, but then that would degrade the integrity of the site don't you think?  Thank you for the redirecting the area of the question, I will take you up on that advise.
amullee44Author Commented:
Change the service account creditials on 5.5 to domain admin account
reboot 5.5 server
give domain admin account local admin rights on exchange 2003 server
rerun install
enter the domain admin password
you can close this question, I figured it out for myself.

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