Due to network or unexpected error, setup can not determine your system type. If this machine is an Windows NT 4.0 (or downlevel) ...

Due to network or unexpected error, setup can not determine your system type. If this machine is an Windows NT 4.0 (or downlevel) Backup Domain Controller, before upgrading this machine please make sure that you have already upgraded your Primary Domain Controller to Windows 2000 or above operating system. Otherwise continuing to upgrade on this system may lead this Backup Domain Controller in unstable state.    Click Yes to continue upgrading, click No to exit from setup.
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