ERROR_INVALID_EXE_SIGNATURE 0x800700BF

Error code 191 · HRESULT 0x800700BF

WINDOWS

Cannot 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_INVALID_EXE_SIGNATURE is a Windows error code (system error 191, returned as HRESULT 0x800700BF) reported by Windows. Its official message is: “Cannot run %1 in Win32 mode.”

How to fix ERROR_INVALID_EXE_SIGNATURE

  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_BAD_EXE_FORMATERROR_INVALID_MODULETYPEERROR_EXE_MARKED_INVALIDWU_E_PT_HTTP_STATUS_SERVICE_UNAVAILWU_E_PT_HTTP_STATUS_FORBIDDENWU_E_UH_INSTALLERFAILUREWU_E_DM_NOTDOWNLOADEDWU_E_SERVICE_STOP

Source: Microsoft WinError.h

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