Navigate to the path: HKEY_LOCAL_MACHINE\SOFTWARE\Nero\Installation\Families\Nero 7\Info (On 64-bit systems, check under HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Nero\... ).
If you do have a serial number, it's wise to verify it before use. This is particularly important if the number is from an older version or an untrusted source. The official method involves using a command: nero 711100 serial number
Possible causes:
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