Windows & BSOD · critical

How to fix0x0000004A

IRQL_GT_ZERO_AT_SYSTEM_SERVICE

What this error means

This critical-severity issue affects the Windows operating system. A critical Windows error indicating that a system service was accessed with an IRQL that was too high. This usually traces back to incompatible software (antivirus, firewall) and bad device driver. 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 3 complete
01Start your PC in safe mode and remove recent software

Start your PC in safe mode and remove recent software.

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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02Check the

Check 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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03drivers Restore the system to the previous point

drivers Restore the system to the previous point.

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

  • Incompatible software (antivirus, firewall)
  • Bad device driver
  • Hardware error