9 steps to fix apc_index_mismatch BSOD like a pro

by Milan Stanojevic
Milan Stanojevic
Milan Stanojevic
Windows & Software Expert
Milan has been enthusiastic about PCs ever since his childhood days, and this led him to take interest in all PC-related technologies. Before joining WindowsReport, he worked as... read more
Affiliate Disclosure
  • Apc_index_mismatch on Windows 10 is an error caused by incompatible drivers or faulty hardware.
  • Windows stop code 0x00000001 or apc_index_mismatch is sometimes attributed to Realtek and Nvidia drivers. 
  • For this reason, to fix the issue, you need to identify the driver, then remove or disable it.
  • Also, certain programs might interfere with the Windows processes, so you need to disable them.

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BSOD errors can be rather troublesome on Windows 10, and in most cases, these types of errors are caused by an incompatible driver or faulty hardware.

The apc_index_mismatch error, for instance, will force your PC to restart whenever it appears. 

This can occur on almost any device, with users of Lenovo or Dell laptops reporting it most often. Also, any Windows version can crash with this stop code.

This error message will sometimes give you the name of the file that is responsible for this error (ntoskrnl.exe, fltmgr.sys, wdf01000.sys, win32k.sys, vhdmp.sys).

Once you know the file name, you need to do a bit of research and find the application or driver that is related to this file.

If the BSOD occurs after installing a specific update, uninstall it. If you have overclocked your hardware, be sure to remove overclock settings and check if that solves the issue.

So let’s see how to fix the apc_index_mismatch issues. Note that you might have to work in Safe Mode if your device doesn’t allow normal booting.

How do I fix the apc_index_mismatch Windows 10 blue screen?

  1. Disable Realtek HD Audio Manager from startup
  2. Install the latest updates
  3. Check your drivers
  4. Deploy a BSOD troubleshooter
  5. Uninstall the DisplayLink driver
  6. Change your RAM frequency
  7. Disable Virtualization in BIOS
  8. Check your hardware
  9. Remove interfereing software

1. Disable Realtek HD Audio Manager from startup

  1. While your computer boots, restart it. You’ll have to restart it a few times before the Automatic Repair starts.
  2. Windows should automatically start the repair process.
  3. Choose Troubleshoot, then Advanced options.
  4. Go to Startup Settings and click the Restart button.
  5. Once your computer restarts again, you’ll see a list of options. Press F5 or 5 to select Safe Mode with networking.

Once you’ve entered the Safe Mode, you can stop the problematic application from starting by doing the following:

  1. Start Task Manager (press Ctrl + Shift + Esc on your keyboard).
  2. Navigate to the Startup tab.
  3. You’ll see a list of startup apps. If you see Realtek HD Audio Manager on the list, right-click it and choose Disable. If that application isn’t on the list, disable all applications from starting with Windows 10.
    Apc_index_mismatch Windows 10 update
  4. Close Task Manager and restart your PC.

Realtek HD Audio Manager can also cause apc_index_mismatch ntoskrnl.exe error, so it’s one of the first applications that you should check.

2. Install the latest updates

  1. Press Windows Key + I to open the Settings app. Now navigate to Update and Security section.
    Apc_index_mismatch Windows 7
  2. Now click Check for updates button.
    Apc_index_mismatch ntoskrnl.exe

Windows will now check for available updates. If any updates are available, they will be downloaded automatically in the background. Once you download the updates, they will be installed as soon as you restart your PC.

Several users reported that they fixed this problem simply by installing the latest updates, so be sure to try that.

3. Check your drivers

  1. If you cannot access Windows 10, enter the Safe Mode.
  2. Start the Device Manager (press Windows Key + X and choose Device Manager from the list).
    Apc_index_mismatch Lenovo
  3. Once the Device Manager starts, locate the newly installed device. (If you see an Unknown Device or any device with a yellow triangle, you’ll need to update its drivers.)
  4. Right-click the device and choose Update driver. In addition, you can also download the latest drivers online.
    Apc index mismatch Realtek

If you wish to keep your Windows 10 PC error-free, we strongly advise that you update all your drivers.

Updating drivers manually can be a long process, but you can use third-party tools to update all your drivers with just a single click.

4. Deploy a BSOD troubleshooter

BSoD errors are particularly unique since there is never a definitive reason why they happen, but there’s always the list of usual suspects, such as damaged registries, damaged DLLs, driver issues, and hardware trouble.

The fastest way to deal with them is to simply use software that can run through all of the above-mentioned variables, and fix them one by one, thus minimizing the chances of BSoD errors triggering.

Using this automatic software increases the chances to detect and fix this annoying BSOD error on your computer.

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5. Uninstall the DisplayLink driver

  1. Open Control Panel and navigate to Programs and Features.
    Apc_index_mismatch blue screen
  2. Locate DisplayLink Core software on the list and uninstall it.
  3. After you’ve uninstalled it, restart your computer.

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In order to completely remove the DisplayLink driver, you need to download and run DisplayLink Installation Cleaner.

After using this software, the DisplayLink driver should be completely removed and the apc_index_mismatcherror should be fixed.

DisplayLink is useful when you have an additional monitor, but unfortunately, it seems that there are certain issues with the DisplayLink driver and Windows 10.

6. Change your RAM frequency

This is an advanced solution, and by performing it you might cause damage to your PC.

Changing the RAM frequency might lead to system instability if not done properly, so bear in mind that you’re doing this at your own risk.

If your motherboard cannot handle the frequency of your RAM, it’s advised that you remove any overclock settings that you have.

Alternatively, you can underclock your RAM so it can match your motherboard frequency.

7. Disable Virtualization in BIOS

  1. Enter BIOS. (To do that on your PC, you need to press Del or F2 during the boot sequence.)
  2. Once you enter BIOS, you need to find and disable the Virtualization feature. (To see how to locate this feature, you might want to check your motherboard manual for detailed instructions.)

After disabling this feature, check if the problem is resolved. If you don’t have a Virtualization feature available in BIOS, you can skip this solution entirely.

8. Check your hardware

As previously mentioned, BSOD errors can appear due to faulty hardware.

According to a few users, the problem was caused by a faulty touchpad on their laptop, and after replacing the touchpad the apc_index_mismatch error was resolved.

If your device is still under warranty, you might want to consider taking it to the official repair shop for a hardware replacement.

9. Remove interfering software

Software such as LogMeIn can cause the error, therefore it’s advised that you update it or remove it from your PC.

In addition to LogMeIn, certain antivirus software, most notably Norton or Avast can cause this issue to occur.

If you’re using any of these antivirus programs, we urge you to remove them by using a dedicated uninstaller to make sure all related files are deleted.

Also, you might want to consider switching to different antivirus software. There are many great antivirus tools that offer great protection and they are fully compatible with Windows 10.

Apc_index_mismacth can cause you a lot of trouble, but fortunately, this Blue Screen of Death error can be easily resolved by using one of our solutions.

If one of our suggestions worked in your case, please let us know in the comments.

Note: This article has constantly been updated for freshness and accuracy. We have been editing the solutions that might fix the problem in accordance with the error’s latest updates. We really hope that you solved your BSOD issue easily and safely.

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Frequently Asked Questions

  • It is an error caused by a driver incorrectly performing an APC (Asynchronous Procedure Call). If you want to fix this read our APC index mismatch fix guide.

  • If you get IRQL NOT LESS OR EQUAL at startup, checking for corrupted files as explained in our guide should help.

  • This type of error can be considered bad since it interrupts your operations and sometimes it can lead to data loss. Learn more about what causes a Blue Screen of Death.

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