I have a domain on a Windows Server 2003 box and a backup domain controller on a Windows Server 2000. The 2 domain controller’s are not replicating properly. When I am logged on the 2000 box I can access the master domain controller through ip but not through dns. I feel as though my 2003 box is corrupt and feel as though I may have to reinstall the os. I try installing support tools but it tells me my configuration data for the product is corrupt. Maybe I can reinstall the service pack 2 on the box or is it possible to reinstall the system files again w/o loosing the current domain. Is it possible to backup the AD / exchange databases and download them to a new os installation or should I just rebuild the domain from scratch. Thanks for any suggestions.