When you restart your DNS server, you may receive one or more of the following event log entries or error messages:
                                 The RPC Server is unavailable. (in DNS Manager)                                 Event ID: 157                                 Source: DNS                                 Description: DNS Server is not root authoritative and no cache file specified.                                 A cache file must be specified when the DNS server is not authoritative for                                 the root domain. The cache file must contain NS record(s) for root DNS                                 servers and corresponding A record(s) for the root DNS servers. Otherwise,                                 the DNS server will be unable to contact the root DNS server on startup and                                 will be unable to answer queries for names outside of its own authoritative                                 zones.                                 Event ID: 7023                                 Source: Service Control Manager                                 Description: The Microsoft DNS Server service terminated with the following                                 error: The system cannot find the file specified.                                 Event ID: 3                                 Source: DNS                                 Description: The DNS Server has shutdown.
The EnableRegistryBoot value is probably incorrect.

Use Regedt32 to navigate to:

HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\Dns\Parameters

Double-click the EnableRegistryBoot value name, in the right hand pane. This type REG_DWORD value has two possible values:

0 - Boot DNS from a boot file.

1 - Boot DNS from the registry.

When you create the first zone, the boot files information is migrated to the registry and EnableRegistryBoot is set to 1.

If DNS won't boot from the registry, set the value to 0.

You may need to copy the backup boot file from

%SystemRoot%\System32\Dns\Backup to %SystemRoot%\System32\Dns.

Start the DNS service.