Re: Server 2008 R2 help
Are your clients using the DNS provided by your new domain controller? I would either setup DHCP on the DC or configure your DNS option under DHCP to point to your domain controller. This way it will properly resolve the domain name to IP address. We're using BIND for DNS at my organization and to bind properly to AD you have to use some special entires in the DNS table that redirects properly to Active Directory.
So again, and more clearly....
Make sure your clients are pointing to your new Active Directory Domain Controller for their DNS. Let me know if this is how you have it configured.