ERROR_CHILD_NOT_COMPLETE 0x80070081

Error code 129 · HRESULT 0x80070081

WINDOWS

The … application cannot be run in Win32 mode.

Windows troubleshooting diagram: Device Manager warning and a system file scan
Windows errors: check drivers, system files and Event Viewer, in that order.

What it means

ERROR_CHILD_NOT_COMPLETE is a Windows error code (system error 129, returned as HRESULT 0x80070081) reported by Windows. Its official message is: “The %1 application cannot be run in Win32 mode.”

How to fix ERROR_CHILD_NOT_COMPLETE

  1. Reboot once — many one-off system codes disappear with a clean restart
  2. Repair system files: 'sfc /scannow' then 'DISM /Online /Cleanup-Image /RestoreHealth'
  3. Find the source in Event Viewer → System: filter for this exact code and open its provider link

Related errors

ERROR_CHILD_PROCESS_BLOCKEDERROR_CHILD_MUST_BE_VOLATILEERROR_CHILD_WINDOW_MENUERROR_PROC_NOT_FOUNDERROR_MOD_NOT_FOUNDERROR_INVALID_NAME

Source: Microsoft WinError.h

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