When you run adprep.exe /domainprep on Windows 2000 Server, or Windows Server 2003, you receive:

Adprep was unable to update domain-wide information. Adprep requires access to existing domain-wide information from the infrastructure master in order to complete this operation.

The %SystemRoot%\System32\Debug\Adprep\Logs\Gpupgrad.log and %SystemRoot%\System32\Debug\Adprep\Logs\Adprep.log files report:

Windows cannot determine the local sysvol location. Upgrade of Domain Group Policy Objects failed. (The system cannot find the file specified.)

This behavior is indicative of a missing, corrupt, or incorrect registry entry.

To resolve this behavior:

1. If your Windows Server is running Windows 2000 server, install the Windows 2000 Support Tools.

2. Open a CMD.EXE window.

3. Type the following command and press Enter.

reg add HKLM\SYSTEM\CurrentControlSet\Services\Netlogon\Parameters /V SysVol /T REG_SZ /D "%SystemRoot%\sysvol\sysvol" /F