Hello,
the Windows server forum page is the place to ask:
http://social.technet.microsoft.com/Forums/en/winservergen/threads
If you post there then add also an unedited ipconfig all from the DC/DNS server and a problem client.
This forum is about forum issues and not for OS problems.
Best regards Meinolf Weber Disclaimer: This posting is provided "AS IS" with no warranties or guarantees , and confers no rights.