ERROR_LOCK_FAILED 0x800700A7

Error code 167 · HRESULT 0x800700A7

WINDOWS

Unable to lock a region of a file.

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_LOCK_FAILED is a Windows error code (system error 167, returned as HRESULT 0x800700A7) reported by Windows. Its official message is: “Unable to lock a region of a file.”

How to fix ERROR_LOCK_FAILED

  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_LOCK_VIOLATIONERROR_MAX_THRDS_REACHEDERROR_BUSYERROR_DEVICE_SUPPORT_IN_PROGRESSERROR_INSTALL_FAILUREERROR_INSTALL_ALREADY_RUNNINGRPC_S_SERVER_UNAVAILABLEWSAEACCES

Source: Microsoft WinError.h

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