Server 2003 Domain name does not have a suffix at all there is no ".com, .local, .anything".

Scenario:
I have taken on a new server 2003 network, this network does not have a proper fully qualified domain name, it is only  "servername.domainname." there is no suffix at the end!  I am unsure if this can be repaired with a DNS adjustment, but I am trying to avoid changing the domain name and then re adding all the workstations back on the network, and dealing with permissions on all folders this would be a lot of work....
Server info:
This is a Server 2003 domain controller with DNS in a 2003 native environment, there is no exchange server, no secondary DNS, no secondary DC, no WINS, and DHCP is on our firewall, this network is somewhat small but would take a long time to do this the difficult way.

How do I fix my domain name with no suffix to have a fully qualified domainname.com without additional problems?

Thanks in advance for the assistance.
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MRrepair2002zAsked:
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Brian PierceConnect With a Mentor PhotographerCommented:
domain names without a suffix can cause issues, the problem is that you cannot chnage the domain name without some agro. To chnage the domain name you neew to make sure the domain is at the 2003 functional level and the the domain rename tools see http://technet.microsoft.com/en-us/windowsserver/bb405948.aspx
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MRrepair2002zAuthor Commented:
that is the article i have been reading as well as the article on Petri,  however i have not found any additional information regarding what the process is, and is what i am looking for if someone could please assist.
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Brian PiercePhotographerCommented:
I don't understand, the article has a link to a document that contains a step-by-step explanation of the process
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