Drivers · critical

How to fixSYSTEM-THREAD-EXCEPTION

SYSTEM_THREAD_EXCEPTION_NOT_HANDLED

What this error means

SYSTEM_THREAD_EXCEPTION_NOT_HANDLED (SYSTEM-THREAD-EXCEPTION) is a critical-severity fault affecting the system driver. A system thread threw an unhandled exception, most commonly a bad driver (.sys) file. Work through the steps below in order.

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 4 complete
01Boot into Safe Mode

Boot into Safe Mode.

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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02Identify the faulty .sys from the stop code

Identify the faulty .sys from the stop code.

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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03Uninstall or update the

Uninstall or update the.

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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04driver Run SFC

driver Run SFC.

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

  • Bad .sys driver file
  • Corrupt driver installation
  • Incompatible driver version