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How to Fix APC_INDEX_MISMATCH Blue Screen Error on Windows 11

Fix APC_INDEX_MISMATCH Blue Screen Error. Step-by-step instructions with SA-specific tips, common pitfalls to avoid & expert recommendations.

Quick Bytes · 23 May 2026 · 3 min read · NexusNerd · ·

pc repair · troubleshooting

How to Fix APC_INDEX_MISMATCH Blue Screen Error on

Quick Answer

The APC_INDEX_MISMATCH blue screen on Windows 11 is typically caused by a driver conflict, a recently installed hardware component, or a corrupted system file. It is most commonly triggered by antivirus software, display drivers, or USB controller drivers behaving unexpectedly during system calls.

What Causes APC_INDEX_MISMATCH on Windows 11?

APC_INDEX_MISMATCH (error code 0x00000001) occurs when the Windows kernel detects an imbalance in Asynchronous Procedure Calls - essentially a driver has completed an APC without properly cleaning up, putting the kernel into an inconsistent state. The crash is a safety mechanism to prevent data corruption rather than a sign of permanent hardware damage.

The most frequent triggers are driver updates gone wrong, particularly GPU drivers (NVIDIA and AMD both have histories of causing this on Windows 11), antivirus kernel-level components that hook into system calls, and third-party USB or audio drivers. If the error appeared after a Windows Update, the update may have conflicted with an existing driver.

Step-by-Step Fix for APC_INDEX_MISMATCH

Start by booting into Safe Mode to confirm the error does not appear without third-party drivers loading. Press and hold Shift while clicking Restart to access Windows 11 recovery options, then choose Startup Settings and enable Safe Mode with Networking. If the system is stable in Safe Mode, a driver is the cause.

Next, check the minidump file. Navigate to C:\Windows\Minidump and look for a file timestamped around the crash. Free tools like WinDbg or WhoCrashed can read this file and usually name the specific driver that caused the crash. This is the fastest way to identify the culprit rather than uninstalling drivers one by one.

If you recently updated your GPU driver, roll it back via Device Manager - right-click the display adapter and choose Roll Back Driver. If rollback is greyed out, use Display Driver Uninstaller (DDU) in Safe Mode to remove the driver cleanly, then install an older stable version.

Run System File Checker and DISM to repair corrupted Windows files: open Command Prompt as administrator and run sfc /scannow followed by DISM /Online /Cleanup-Image /RestoreHealth. These commands fix corrupted system files that can cause blue screen errors independently of drivers.

Frequently Asked Questions

Is APC_INDEX_MISMATCH a hardware failure? Not usually. It is most often a software or driver issue. If the error persists after reinstalling all drivers and repairing Windows, run a RAM diagnostic with Windows Memory Diagnostic to rule out faulty RAM modules.

Can antivirus software cause APC_INDEX_MISMATCH? Yes - antivirus programs that use kernel-level drivers are a known cause. Temporarily disabling real-time protection (not uninstalling) will not fix a kernel driver conflict; you need to fully uninstall the antivirus to test this.

Does a Windows 11 update cause this error? Some cumulative updates have shipped with driver compatibility issues. If the error started after a specific update, use Settings - Windows Update - Update History to uninstall that update and test stability before Microsoft releases a fix.