Solved: APC Index Mismatch on Windows 11 (4 Ways)

Overview of APC Index Mismatch on Windows 11

APC_INDEX_MISMATCH is a specific type of Blue Screen of Death (BSOD) error that can occur on Windows-based computers. It is typically associated with compatibility issues between a driver and the operating system.

When the APC_INDEX_MISMATCH error occurs, it indicates that there is a mismatch or inconsistency in the index of a kernel-mode APC (Asynchronous Procedure Call). An APC is a mechanism used by Windows to asynchronously execute functions in kernel mode. This error suggests that the APC's index does not correspond correctly to the expected value, resulting in a system crash.

There are several potential causes for the APC_INDEX_MISMATCH error, including:

• Outdated or incompatible device drivers: Incompatible or outdated drivers can trigger this error. It is essential to keep your drivers up to date to prevent such issues.
• Malware or system file corruption: Malicious software or corrupted system files can interfere with the proper functioning of APCs and lead to this error.

To troubleshoot and resolve the APC Index Mismatch on Windows 11, you can try the following 4 ways.

How to Fix APC Index Mismatch on Windows 11 with 4 Ways

This section will list four effective ways to help you solve APC Index Mismatch on Windows 11.Check it out now!

1. Disable Realtek HD Audio Manager at Startup

When troubleshooting stop code APC Index Mismatch on Windows 11, it is advisable to prioritize checking the Realtek HD Audio Manager application as it has been known to be a potential cause of such issues.

Step 1. Restart your computer multiple times during boot to initiate Automatic Repair. Windows will then begin the repair process. Next, select Troubleshoot and navigate to Advanced options.

Step 2. Navigate to the Startup Settings and select the option to restart by clicking on the designated button.

Step 3. After your computer has restarted, a list of options will appear. Choose the option for Safe Mode with Networking by pressing either F5 or 5.

After successfully entering Safe Mode, you can prevent the problematic application from launching by following these steps:

• Launch Task Manager by pressing Ctrl + Shift + Esc on your keyboard.
• Go to the Startup tab within Task Manager.

• A list of startup apps will be displayed. For instance, if you come across Realtek HD Audio Manager in the list, right-click on it and select the option to disable. In case you don't find that particular application on the list, disable all the applications that initiate with Windows 11.

Step 4. Exit Task Manager and proceed to restart your PC.

2. Update to the Latest Version

Many users have reported resolving this issue Windows 11 blue screen APC Index Mismatchby simply installing the most recent updates. Therefore, it is highly recommended that you attempt this solution as well.

Step 1. To access the Settings app, press the Windows Key + I combination on your keyboard. From there, navigate to the Update and Security section.

Step 2. Next, locate and click on the Check for updates button.

Windows will initiate a check for available updates at this point. If any updates are found, they will be automatically downloaded in the background. After the updates have been downloaded, they will be installed once you restart your PC.

3. Verify Your Drivers

To maintain a Windows 11 PC free from errors, it is highly recommended to update all of your drivers.

Step 1. If you are unable to access Windows 11, you can enter Safe Mode. To access the Device Manager, press the Windows Key + X hotkeys and select Device Manager from the provided list.

Step 2. After launching the Device Manager, locate the recently installed device.

Tip: If you come across an Unknown Device or a device marked with a yellow triangle, it indicates the need to update its drivers.

Step 3. Right-click on the device and select the option Update driver. Additionally, you can also consider downloading the latest drivers from the internet.

4. Removethe DisplayLink Driver

While DisplayLink can be beneficial for adding an extra monitor, it is worth noting that there are certain compatibility issues between the DisplayLink driver and Windows 11.

Step 1. Access the Control Panel and proceed to the Programs and Features section.

Step 2. Find the DisplayLink Core software within the list and select the Uninstall button to proceed with its removal.

Step 3. Once you have successfully uninstalled the DisplayLink Core software, proceed to restart your computer.

These 4 methods are also applicable to solving APC Index Mismatch on Windows 10.

Backup Your Windows 11 to Protect Your Data Completely

To address the APC_INDEX_MISMATCH error in Windows 11, I hope one of the methods mentioned above will help you resolve the issue. This error is just one of the common problems faced by Windows 11 users, as there are other issues that can arise as well.

In such situations, having a system backup can be highly beneficial in quickly resolving these problems. I recommend using AOMEI Backupper Standard, a free system backup software designed for Windows 11/10/8.1/8/7/Vista/XP. The software is user-friendly with a concise interface. Here are some key features of AOMEI Backupper Standard:

▶Backup files, system, partitions, and disks on your computer.
▶Create backups to local disks, external devices (USB, HDD, SSD, etc.), cloud storage, NAS, or network shared folders.
▶Schedule automatic backups with five available modes: Daily, Weekly, Monthly, Event triggers, and USB plug in.
▶Choose different backup methods, including full backup, incremental backup, and differential backup (Differential backup available in the Professional edition).

Backing up your system is a simple process requiring just a few clicks. Download and install the AOMEI Backupper Standard software on your computer.

Step 1. Launch the software, click on the Backup option, and select System Backup.

Step 2. Customize the Task Name to differentiate it from other backup tasks. By default, the program will select the system and boot partitions as the source. Now, select a destination path where you want to save the system backup. You have the option to back up your computer to a USB drive, external storage, network share, NAS, or other suitable locations.

Step 3. Click on the Start Backup button to initiate the system backup process in Windows 11/10/8/7.

Conclusion

This article lists four ways to fix APC Index Mismatch on Windows 11. you can choose any one of them to try to fix this error according to your needs. In fact, it is very important to back up your Windows 11 data in advance so that you can quickly roll back to the previous normal version in case your system has problems. It will not make you lose any data.

AOMEI Backupper is not only such a great backup software to backup your Windows 11 easily but also a great sync software with basic sync feature. Try it now!