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0X000000EF

Blue Screen (BSOD) CRITICAL_PROCESS_DIED Applies to: Windows 7, Windows 10, Windows 11

What it means

A core Windows process crashed unexpectedly — often tied to a recent update or corrupted system files.

Also seen as: CRITICAL_PROCESS_DIED, 0xEF

Quick fix steps

  1. Boot into Safe Mode and run "sfc /scannow".
  2. Follow up with "DISM /Online /Cleanup-Image /RestoreHealth".
  3. Uninstall the most recent Windows Update if the crash started right after one.
For the full step-by-step walkthrough, see CRITICAL_PROCESS_DIED Blue Screen.

Frequently Asked Questions

Is CRITICAL_PROCESS_DIED as serious as it sounds?
The name is alarming, but the causes (corrupted system files, a failing drive, a bad driver) are similar to other blue screens and are usually fixable with standard diagnostic steps rather than requiring a reinstall.
Should I be worried about losing data?
The crash itself doesn't delete files — the main risk is unsaved work at the moment of the crash, the same as with any blue screen.

Other error codes

0X0000001A — MEMORY_MANAGEMENT

Points to a problem with how memory is being handled — faulty RAM, a driver mismanaging memory, or disk corruption.

0X0000000A — IRQL_NOT_LESS_OR_EQUAL

Almost always a driver issue — most commonly network, audio, or graphics drivers.

0X0000001E — KMODE_EXCEPTION_NOT_HANDLED

A driver running in kernel mode hit an error it couldn't recover from — usually a specific faulty or outdated driver.

0X0000007B — INACCESSIBLE_BOOT_DEVICE

Windows can't access the drive it needs to boot from — often after a storage driver change, BIOS setting change, or drive connection issue.