8 steps to fix apc_index_mismatch BSOD like a pro

Milan Stanojevic
by Milan Stanojevic
Deputy Editor
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  • Apc_index_mismatch on Windows 10 is an error often caused by an incompatible driver 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 again 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. Deploy a BSOD troubleshooter
  2. Disable Realtek HD Audio Manager from startup
  3. Install the latest updates
  4. Check your drivers
  5. Uninstall the DisplayLink driver
  6. Change your RAM frequency
  7. Disable Virtualization in BIOS
  8. Check your hardware
  9. Remove interfereing software

1. Deploy a BSOD troubleshooter

Blue Screen of Death, or BSOD (as it is commonly known), is a stop or exception screen error that appears whenever your Windows PC is affected by a fatal system error. The colored screen (blue, red, black, pink) that is associated with this problem has become a synonym for issues on Windows, and entails a system crash or a state in which your operating system can no longer run safely. BSoD errors can appear because of a variety of causes including malfunctioning hardware, corrupt drivers, problematic DLLs, power supply issues, or even overheating of specific components of your PC. Hardware issues that cause BSoD can be obviously resolved by replacing/repairing the damaged components, but resolving this issue when software is the fault can be very tricky and potentially dangerous for your system. To avoid any unwanted issues by attempting a fix on your own, we recommend that you use a specialized Windows repair software, and the best option for this task is by far Restoro.
windows troubleshooters
This powerful and yet compact software enables you to resolve BSoD errors with just a few clicks of your mouse and without the need to worry about any other side effects. Next, we will present you with a step-by-step guide that will allow you to successfully set up Restoro, and start resolving a great variety of issues, including the dreaded BSoD:
  1. Download and install Restoro.
  2. Launch Restoro
    • Restoro will now compile data about your PC.
      Restoro first scan
  3. Wait for it to find any system stability issues and possible malware infections.
    • Once the scan is complete, Restoro will show you a summary of your PC’s current status.
      Restoro repair
  4. Press Start Repair.
    • Restoro will now start downloading and replacing and faulty registries, DLLs, and any other damaged files it may have found during the scan.
    • This is possible thanks to the online libraries that is uses for comparison, replacing damaged data with its perfectly functional equivalent.
  5. Restart your PC for all the changes to take effect.
Your PC should now work perfectly fine, and you will no longer have to worry about slow response times, BSoD errors, or anything of the sort. Disclaimer: This program needs to be upgraded from the free version in order to perform some specific actions.

2. 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.

3. 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.

4. 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 DriverFix to update all your drivers with just a single click.

Some of the most common Windows errors and bugs are a result of old or incompatible drivers. The lack of an up-to-date system can lead to lag, system errors or even BSoDs. To avoid these types of problems, you can use an automatic tool that will find, download, and install the right driver version on your Windows PC in just a couple of clicks. DriverFix Updater We strongly recommend DriverFix. This is a safe and resource-saving tool that will be your best advisor for this type of operations. Follow these easy steps to safely update your drivers:
  1. Download and install DriverFix.
  2. Launch DriverFix.
  3. Wait for DriverFix to detect all your faulty drivers.
DriverFix Updater Scan
  1. DriverFix will now show you all the drivers that have issues, and you just need to select the ones you’d liked fixed.
DriverFix Updater Results
  1. Wait for DriverFix to download and install the newest drivers.
DriverFix Updater Update Drivers
  1. Restart your PC for the changes to take effect.


Your Windows will stay safe from any type of errors and changes. Download and install DriverFix now!
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Disclaimer: this program needs to be upgraded from the free version in order to perform some specific actions.

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.

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

Apc index mismatch overclocking

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.

Test your system to detect and prevent overclocking settings with these amazing tools.

7. Disable Virtualization in BIOS

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 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

how to fix apc index mismatch

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 such as IObit Uninstaller Pro, 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.

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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I was getting a blue screen with APC index mismatch on my Windows 8.1. I updated Realtec driver and this solved my issue! Thank you!

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