I have a 8 user Windows 2000 AD domain. My Win2000 DC was using IP 192.168.1.2 and 192.168.1.3. Seems DCHP and DNS were using IP 192.168.1.3, I know this when I ping the server name. I changed DNS to use 192.168.1.2 and changed all DHCP options. Now when users login the get loading personal setting for about 45 minutes, I eventually get them to login. No DNS errors.