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ZepFluous's avatar
ZepFluous
Iron Contributor
Jan 01, 2026

KMS activation of Windows 11 failed

When attempting to activate the Windows system using the KMS tool, the process fails with error code 0x80040154. The specific message states, “The class is not registered.” How can this issue be resolved?

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device management

1 Reply

  • Enzoip's avatar
    Enzoip
    Iron Contributor
    Jan 08, 2026

    The error code 0x80040154 with the message "The class is not registered" typically indicates that a COM component or DLL required for the activation process is missing or not properly registered. When using KMS tools or scripts for Windows activation, this error often points to issues with system components related to licensing or Windows Management Instrumentation (WMI).

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