How can I change my FQDN of my Domain Controller?

Dear Sir,

I have one Domain Controller in my school with the name of "ISCADKC"; I added a new replica domain as secondary.
Then I need to transfer the FSMO Roles from the First server to the second one to be as primary domain controller, and then I need to remove completely the First ONE.

I need to add [.com] to my Domain to be [ISCADKC.com], how can I change it without affecting problems for users?
I have around 70 computers joined to this domain?

Please any help.

Thank you in advance,
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ISC-IT-AdminAsked:
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Brian PiercePhotographerCommented:
OK so what you are really lookig at is a domain rename - this is not without risk, but there are tools to do it - see http://www.petri.co.il/windows_2003_domain_rename.htm
and
http://technet.microsoft.com/en-us/windowsserver/bb405948.aspx
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