Steps To Fix APC_INDEX_MISMATCH Blue Screen Error Windows 10


Steps To Fix APC_INDEX_MISMATCH Blue Screen Error Windows 10

Troubleshooting Guide To Fix  APC_INDEX_MISMATCH Error On Windows 10

Run System Diagnostic

In case of any blue screen error, try running the hardware test first to check the hardware status of your PC. Most of the times faulty hardware components are responsible for APC_INDEX_MISMATCH error, run a hardware diagnostic on your computer. Dell users can shut down the computer, now start your PC and immediately keep tapping F12 continuously on your keyboard, on the boot menu screen select Diagnostic and press the Enter key on the keyboard to run the hardware test. Other brands (HP, Lenovo, Asus, Acer, etc) users can follow the steps provided by your manufacturer to run the hardware test, you can also search online or contact system manufacturer to learn how to run a hardware test on your PC. If the hardware components are perfectly fine, move on to the next step.


Write Powershell in the windows search box, make a right click on Windows Powershell and select Run as administrator.

Powershell as an admin

Copy and paste this command dism.exe /Online /Cleanup-image /Restorehealth on the PowerShell Window and press the enter key on the keyboard.


Run SFC Scan: Open Powershell windows once again, copy and paste this command sfc /scannow. It may take some time to finish the scan, do not close the windows before the scan completes.

Update Devices From the Device Manager

Outdated driver or improper installation of the device driver can also result in APC_INDEX_MISMATCH error. Press Windows + I key to open the Run box, type devmgmt.msc in the run box and click on OK to launch Device Manager, make a right click on desired device and select Update driver

Update devices from device manager

Also, check all device one by one to see if any device shows a yellow exclamation mark in front of them. If you see a yellow exclamation mark, make a right click to update them.

yellow exclamation mark in device manager

You can also make a right click on it and click uninstall and restart your PC, it should install the default driver itself, if not make a right click to install or update.

Roll Back Device Drivers

If you think that recent installation of any driver may be the reason for APC_INDEX_MISMATCH error. Try to roll back the device driver, launch the device manager, determine which driver was installed recently, select that device, make a right click on it and go to the Properties, go to the Driver tab, click on Roll Back Driver and Restart the PC.


Skip the step if Roll Back Driver option is greyed out for all the possible devices.

Run Anti Virus Program

Viruses can corrupt and infect your Windows and can cause APC_INDEX_MISMATCH error, run anti-virus scan to find out any infections and fix them. If you don’t have any third party anti-virus program you can run Windows Security. Type in Windows Security in Windows search box and open it, select Virus & threat protection, go to Scan options and run a Full Scan.

Run Full Scan using Windows Security

Run Disk Scan

Running a disk scan can let us know about the system files errors which may be the reason of APC_INDEX_MISMATCH error, make a right click on the desired drive, mostly it’s a C drive where windows are installed. Go to the Properties and select the Tools tab and click on Check.

Scan disk

Update Windows 10

Windows update is very important as Microsoft keeps updating windows to fix many bugs and errors. So updating windows may fix APC_INDEX_MISMATCH error. Press Window + I to open Windows 10 Settings > Update & security > Windows Update > Check for updates, restart your PC after the update.

check for updates Windows 10

Update BIOS Firmware And Graphics Drivers

Updating the BIOS to latest version fixes multiple issues with the system, please visit PC manufacturer’s site to update the system BIOS, sound driver, and all the important driver.

Updating of graphics card is very important to fix APC_INDEX_MISMATCH error. Use the below links to update the graphics driver, integrated Intel Graphics driver can be updated from device manager.

Update Nvidia Driver

Update AMD Driver

Uninstall Recently Installed Windows 10 Update

Sometimes installation of Windows 10 updates may result in APC_INDEX_MISMATCH error, in that case uninstalling the recent update may fix the error.

Open Windows 10 settings and click on View update history.


Click on uninstall updates which were recently installed.


Uninstall update one by one

Restart your PC after the uninstallation.

System Restore

You can restore your PC from a system restore point to fix APC_INDEX_MISMATCH error. It will undo all the recent changes made to the PC which may be the root cause of the error.

System restore will not interfere with your personal files, it will get rid of all the apps and updates that were installed after the restore point.

Write System Restore in Windows search box and open Create a restore point


Go to System Protection click on System restore


You cannot perform a system restore if System Restore option is greyed out, in case its clickable then select recommended restore or Choose a different restore point as shown below. Select a date which you think is related to the app, driver or update which has caused the APC_INDEX_MISMATCH error and then click on next. Select the restore point created before the APC_INDEX_MISMATCH error appeared.


Choose the date and click on Next


Confirm your restore point and click on Finish.


It may take a long time to complete the process.

Sometimes in case of APC_INDEX_MISMATCH error, you are not able to use the computer because it keeps restarting and it may be impossible to perform the above steps to fix blue screen error. In that case follow the steps mentioned below:

Use Safe Mode

APC_INDEX_MISMATCH error can occur as soon as you log in to the windows and the system restarts, the system goes in a loop. In this scenario press and hold the Shift key on the keyboard and while holding the shift key click on the restart on Windows login screen as shown below to go to the Advanced Boot Options.

Windows 10 login screen

In case you are not able to go to the login screen then fail the system to start for a couple of times to go to the Windows Recovery Environment. To do so, start your PC, as soon as you see the system logo (Dell, Lenovo. HP, etc) hard shut down your PC by pressing and holding the power button, try this couple of times, it will take you to the Windows Recovery Environment.

Now click on Troubleshoot

Troubleshoot advanced option

Now click on Advanced options and then click on Startup Settings

Advanced options startup settings

Click on Restart

Restart Startup settings

The system should restart, press F4 or the 4 key on the keyboard to select Enable Safe Mode

Startup settings F4

In safe mode try uninstalling windows update, corrupt driver which may be the reason of APC_INDEX_MISMATCH error. Follow the same steps mentioned above to uninstall recently installed Windows update.

Uninstall app which you don’t need which you think may be causing APC_INDEX_MISMATCH error.

Press  Windows+ R key to open Run Box, type in appwiz.cpl and click OK.

Run-box appwiz.cpl

Click Uninstall to remove unnecessary Apps from your PC

uninstall program

Do System Restore From Windows Recovery Environment

Follow the same steps to go to the Advanced Boot Option, start your PC, as soon as you see the system logo (Dell, Lenovo. HP, etc) hard shut down your PC by pressing and holding the power button, try this couple of times, it will take you to the Windows Recovery Environment.

Click on Troubleshoot

Troubleshoot Windows 10

Select Advanced options, click on System restore


The system will restart now, select your account and sign in then click Next

Date selection in system restore

Select the restore point created before the APC_INDEX_MISMATCH error, click on Next, Click Finish to start System Restore.

Reset Your Computer/ Reinstall the Windows 10

In case, none of the steps resolves the APC_INDEX_MISMATCH error then it may the corrupt OS which needs to be reinstalled. You will lose all the data and apps on your PC, backup your data if you can. Visit the below link and follow the steps to reinstall Windows 10 on your PC.

Reinstall Windows 10

Few Important Things to Keep In Mind

  • Do not overclock your hardware component to avoid APC_INDEX_MISMATCH error.
  • Contact your System manufacturer if you are receiving APC_INDEX_MISMATCH error after replacing a hardware component on your PC.
  • Try swapping the memory module on your PC in case there are multiple memory installed, you can also try to use different memory slot and check your PC.

Wrap Up

I hope at least one of the steps mentioned in this article helped you to resolve APC_INDEX_MISMATCH blue screen error on your PC.

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