Workstations are not Authenticating with the Domain Controller

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Workstations are not Authenticating with the Domain Controller

I am having problems getting the workstations to run Group Policies, reconnect to mapped network drives, run scripts, etc.

I currently have 6 Domain Controller spread across 8 remote locations, so it is hard to determine where exactly is my problem, but I do believe I have narrow it down to my PDC, which is also my DNS server.

This is the error on the workstation:
The processing of Group Policy failed because of lack of network connectivity to a domain controller. This may be a transient condition. A success message would be generated once the machine gets connected to the domain controller and Group Policy has successfully processed. If you do not see a success message for several hours, then contact your administrator.

Then I check the log on the Primary DC and I get this:
Active Directory could not use DNS to resolve the IP address of the source domain controller listed below. To maintain the consistency of Security groups, group policy, users and computers and their passwords, Active Directory successfully replicated using the NetBIOS or fully qualified computer name of the source domain controller.

Invalid DNS configuration may be affecting other essential operations on member computers, domain controllers or application servers in this Active Directory forest, including logon authentication or access to network resources.

You should immediately resolve this DNS configuration error so that this domain controller can resolve the IP address of the source domain controller using DNS.

The DNS log on the same server:
The DNS server was unable to complete directory service enumeration of zone UGATL-MAIN.local. This DNS server is configured to use information obtained from Active Directory for this zone and is unable to load the zone without it. Check that the Active Directory is functioning properly and repeat enumeration of the zone. The extended error debug information (which may be empty) is "". The event data contains the error.

I have been having this problem for 2 months and it has halted my Windows 7 deployment....... PLEASE HELP!!!

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