Getting DNS error message when trying to join Windows 7 Pro PCs to domain.

Hello,

I had to do a clean install of SBS2003.  I am able to get WinXP PCs to join the domain, but not Win7 PCs.  When I try to join the Win7 PCs, I get:

The following error occurred attempting to join the domain :

An attempt to resolve the DNS name of a domain controller in the domain being joined has failed.  Please verify the client is configured to reacha DNS server that can resolve DNS names in the target domain.

I followed the steps at http://social.technet.microsoft.com/Forums/en-US/winserverDS/thread/d772f2c8-1029-4f26-9062-d12557e4725d

Also, if I assign only the DNS server IP address, server or workstation, I am not able to get on the Internet.  In order to access the Internet, I have to add the router's IP address.

Any help is greatly appreciated.

Thanks in advnce,

Don