Windows & BSOD · critical

How to fix0x000000EF

CRITICAL_PROCESS_DIED

What this error means

CRITICAL_PROCESS_DIED (0x000000EF) is a critical-severity fault affecting the Windows operating system. A critical system process (winlogon, csrss, lsass) has terminated. Typical causes include malware and bad update. See the troubleshooting steps below for the fix.

Before you begin

Save open work and back up important files. Note any recent driver or hardware changes. If Windows cannot start, use the startup guide first.

Work through these checks

0 of 3 complete
01SFC and DISM

SFC and DISM.

Use the instructions for your exact device and operating system. Check the manufacturer’s documentation before changing firmware, hardware, or system settings.

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02System Restore

System Restore.

Use the instructions for your exact device and operating system. Check the manufacturer’s documentation before changing firmware, hardware, or system settings.

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03Clean install of Windows

Clean install of Windows.

Use the instructions for your exact device and operating system. Check the manufacturer’s documentation before changing firmware, hardware, or system settings.

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Possible causes

  • Corrupted system files
  • Malware
  • Bad update