We have a small network at my workplace centered around a Windows Server 2003 Server computer. We have NAS and several Windows XP computers connected with active directory support. For a Windows XP machine, I simply change the domain to "domain-name.columbia.edu" and log in with the domain administrator password and the computer is immediately under AD control. However, both Windows Vista and Windows 7 give me errors when I use this approach. The error is that it cannot resolve the DNS address. However, when I check the DNS servers (using ipconfig /all) I can clearly see the server computer's IP address which is our DNS server. I can ping the server computer and vice versa. Is there a setting in Windows 7/Vista I need to change for it to work with a Windows 2003 DNS server? I am officially stumped! *grumpy look* Thank you for any help. I have little server experience but I am very computer literate so involved protocols are OK! Regards, Mike