11 Fixes For Blue Screen Due To APC Index Mismatch

The most troublesome of all Windows 10 errors are the BSOD (Blue Screen Of Death) errors that cause all Windows processes to stop or sometimes cause system crash.

APC (Asynchronous Procedure Call) index mismatch is a Blue screen error that will cause your PC to restart and crash Windows with an error message containing the name of the culprit file such as win32k.sys, vdmp.sys, wdf01000.sys, fltmgr.sys, and ntoskrnl.sys.

In this disquisition, we will walk you through the process of fixing the APC Index Mismatch Blue screen error in Windows 10. The error is most often reported for Dell or Lenovo system users.

Solutions To Fix An APC Index Mismatch BSOD

  1. Install The Latest Windows Update
  2. Check System Files With SFC
  3. Update The Driver Or Reinstall The Driver
  4. Disable Realtek HD Audio Manager From Startup
  5. Deploy A BSOD Troubleshooter
  6. Uninstall The Display Link Driver
  7. Change Your Ram Frequency
  8. Disable Virtualization In BIOS
  9. Check Your Hardware
  10. Remove Interfering Software
  11. Reset Or Reinstall Windows

Enter in safe mode

Before you begin with any of the below fixes, you must log in to Windows in safe mode. It will run the OS with a bare minimum with the basic device drivers and system settings. This will keep the APC index mismatch BSOD blue screen at bay for some time and allow you to go ahead with the fixes.

Step 1. Power off your system and restart a few times while on the Windows logo screen to enter the Windows Automatic Repair starts window.

Step 2. Navigate to troubleshoot option -> Advanced options -> Startup settings.

Step 3. Press the Restart button and use the number or function keys to choose Enable Safe Mode with Networking. It’s usually option 5 so press the 5 or F5 key to access it.

Step 4. Your Windows will now restart in safe mode with networking. You can follow the below-given fixes without any threat to your personal data.

Fix 1: Install The Latest Windows Update

Microsoft releases constant updates for Windows 10 to resolve the known bugs and provide security patches. The APC Index Mismatch BSOD error can occur if a Windows update isn’t installed.

Step 1. Simultaneously press the Windows icon, and I key to open the Settings app.

Step 2. Navigate to the Update & Security section.

Step 3. In the Windows Updates tab on the left pane, click on the Check for updates button on the right side.

Check for optional updates to resolve APC Index Mismatch Error

Windows will perform a search for Microsoft’s server. If any updates are available, they will be downloaded automatically. Wait while your computer restarts, and hopefully, the BSOD stop code will be fixed.

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Fix 2: Check System Files With SFC

Windows 10 offers system utility tools called System File Checker (SFC) and Deployment Image Servicing and Management (DISM) to scan and repair system files to resolve any problems with the Operating system.

Step 1. Simultaneously press the Windows icon and X key and select Command Prompt (Admin) or Windows PowerShell (Admin) from the menu.

Command Prompt or PowerShell as Admin

Step 2. Write DISM /online /cleanup-image /restorehealth in the command line to check the system image for any issues.

Run Deployment Image Servicing and Management (DISM) utility tool

Step 3. Once the scan is complete, type sfc /scannow in the command line to scan and repair system files.

Run SFC utility tool

Step 4. Wait patiently for the process to complete. Restart your PC once it’s complete and check if the stop code is fixed. 

Fix 3: Update The Driver Or Reinstall The Driver

Faulty or incompatible drivers are the most general cause behind most computer errors. APC mismatch error could also be caused if your system drivers aren’t updated or compatible with the Windows version.

The drivers with a yellow exclamation mark next to them are either not properly installed or have compatibility issues.

Step 1. Simultaneously press the Windows icon and X key and select Device Manager from the open menu.

Step 2. The Device Manager contains all the driver categories currently available on your system. Scroll down and check all your drivers to locate the faulty driver, say Sound, video, and game controllers driver.

Device manager starts Uninstall device

Step 3. Right-click on the driver and tap the Update driver.

Step 4. In the next window, choose Search automatically for updates in the pop up window and allow the driver to get updates.

If the above process doesn’t resolve your issue or know which driver is problematic, you can download third-party driver updater software such as DriverFix, Driver Easy, etc.

You can also choose to roll back your driver to fix APC Index Mismatch. It will revert the current driver version to the previously stored version of the driver in your system.

Step 1. Simultaneously press the Windows icon and X key and select Device Manager from the open menu.

Step 2. The Device Manager contains all the driver categories currently available on your system. Scroll down to locate the problematic driver, say Sound, video, and game controllers driver.

Roll back audio driver

Step 3. Right-click on the driver and tap Properties.

Step 4. Go to the Driver tab and check If the Roll Back Driver option is enabled. If it is, click it, and it will roll back the driver version.

Select reason to roll back audio driver

Step 5. Answer the reason why you want to roll back and press Yes.

Step 6. Once the driver is rolled back, restart your computer and perform a bug check for APC Index Mismatch defect.

Fix 4: Disable Realtek HD Audio Manager From Startup

Sometimes some startup applications affect the boot process and cause APC Index Mismatch BSOD error.

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Step 1. Simultaneously press Ctrl + Shift + Esc keys to open the Task Manager window.

Step 2. Navigate to the Task manager Startup tab and locate Realtek HD Audio Manager. If you can’t find it, search through the list to identify any unnecessary programs that load at startup.

Step 3. Double click on unnecessary startup programs and choose Disable.

Step 4. Close task manager and restart your computer and check for the blue screen error.

Fix 5: Deploy A BSOD Troubleshooter

The guide provides you with numerous fixes, each targeting a specific reason for error APC Index mismatch. However, you can do all this at once using a BSOD troubleshooter.

BSOD errors can occur due to various reasons such as driver issues, hardware problems, damaged registries, and damaged DLLs.

You can tackle all these variables in one place using Restoro, which is a third-party BSOD troubleshooter. Restoro has a vast online database that can replace any element responsible for causing BSOD stop code.

Step 1. Go to the Restoro website and download and install the software by following the on-screen instructions.

Step 2. Launch Restoro and wait for the software to identify corrupted files and other stability issues.

Step 3. Press the Start Repair button to allow the software to repair the BSOD error.

Step 4. Restart your computer and check if the APC Index Mismatch BSOD error is fixed.

Fix 6: Uninstall The DisplayLink Driver

If you use multiple screen displays connected to a single computer, chances are you must be familiar with DisplayLink core software.

Sometimes the drivers for this software are not fully compatible with Windows and give a stop code APC index mismatch BSOD error.

Step 1. Press Windows icon key and write the control panel in the search box. Tap the Control Panel option shown in the results.

Step 2. On the top right corner, in View By dropdown, choose Category.

Step 3. Under the programs section, click Uninstall a program.

Fix APC Index Mismatch Blue screen

Step 4. Scroll down in the Program and Features window and locate DisplayLink software.

Step 5. Click on it and press the Uninstall button at the top. Download DisplayLink Installation Cleaner to completely uninstall the device.

Step 6. Restart your computer and check if the APC Index Mismatch error is fixed.

Fix 7: Change Your RAM Frequency

Changing RAM frequency is an advanced solution and requires you to know what you want to do and what frequency you wish to achieve.

If the frequency isn’t set correctly, it could make the system unstable. It is essential that the motherboard can handle the frequency you set. Thus, before going forward, remove any overclock settings.

It is not recommended to have your CPU, GPU, or RAM overclocked as it could to system failure. You can employ the hit and trial method to increase or decrease the RAM, CPU, or GPU frequencies.

Fix 8: Disable Virtualization In BIOS

Sometimes users turn on virtualization in BIOS that can cause APC Index Mismatch BSOD error.

Step 1. Power on your computer and press F2 during the boot sequence.

Step 2. In the BIOS Setup, navigate to the Virtualization feature. You can find it using the motherboard manual.

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Step 3. Disable virtualization and Save and Exit from BIOS. Allow your computer to boot normally.

Fix 9: Check Your Hardware

Faulty hardware such as a touchpad, mouse, keyboard, etc., could be a potential cause for APC Index Mismatch BSOD error.

If you are getting the APC Index Mismatch stop code after getting a newly installed device, you might want to replace it as it isn’t compatible with your computer.

Fix 10: Remove Interfering Software

Software such as antivirus software (Norton or Avast), LogMeIn, etc., can interfere with your Operating System and generate APC Index Mismatch errors.

You must remove such software using a good uninstaller along with all their related files.

Windows 10 comes with a powerful Defender, which cancels out the need for any antivirus software; however, if you still need one, consider switching to better antivirus software that will not interfere with your operating system’s processes.

Fix 11: Reset Or Reinstall Windows

Unfortunately, if none of the above fixes have worked for you, you should consider performing a complete reset or reinstall Windows.

Before going ahead with this solution, you should backup all your essential data on a hard disk. Windows 10 allows you to reset Windows while opting to keep your personal data intact.

For reinstalling Windows, you must create a USB flash drive containing Windows image and boot your computer while the USB is inserted.

For reinstalling Windows, you must create a USB flash drive containing Windows image and boot your computer while the USB is inserted.

Final Word

BSOD errors are troublesome and could be caused by inserting the unknown device, startup apps, interfering software, DisplayLink drivers, incompatible system drivers, virtualization, missing system files or DLLs, etc. 

We hope this disquisition was helpful to you to fix APC Index Mismatch error for your Windows Operating system. 

FAQs

What Is An APC Index Mismatch?

The APC (Asynchronous Procedure Call) index mismatch is a BSOD error that will cause your PC to restart and crash Windows with an error message containing the name of the culprit file such as win32k.sys, vdmp.sys, wdf01000.sys, fltmgr.sys, ntoskrnl.sys.

How Do I Resolve The APC Index Mismatch Error?

1. Install The Latest Updates
2. Check Windows System Files With System File Checker
3. Update Or Reinstall The Driver
4. Disable The Realtek HD Audio Manager From Startup
5. Deploy A BSOD Troubleshooter
6. Uninstall The Display Link Driver
7. Change Your Ram Frequency
8. Disable Virtualization In BIOS
9. Check Your Hardware
10. Remove Interfering Software
11. Reset Or Reinstall Windows

How Do I Resolve Win32kfull Sys?

1. Install The Latest Windows Update
2. Check Corrupted System Files With SFC
3. Update Or Reinstall The Driver
4. Disable The Realtek HD Audio Manager From Startup
5. Deploy A BSOD Troubleshooter

How Do I Resolve The BSOD APC Index Mismatch In Win32kfull?

1. Install The Latest Updates
2. Check System Files With System File Checker
3. Update The Driver Or Reinstall The Driver
4. Disable Realtek HD Audio Manager From Startup
5. Deploy A BSOD Troubleshooter