I have just setup a new sbs 2008 domain. The dc controls all dns and dhcp. There are 4 computers total, 2 windows xp and 2 windows 7 computers. The windows xp computers join to the domain just fine. When i try and join a windows 7 computer to the domain i get and error "An attempt to resolve the DNS name of a domain controller in the domain being joined has failed...." The dns on the workstations are set to the IP of the dns server.