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A Guide to the APC_INDEX_MISMATCH Blue Screen of Death Error

Error Name: APC_INDEX_MISMATCH

STOP Code: 0x00000001

You’ve got a Blue Screen of Death, and you’ve noted that the error is called APC_INDEX_MISMATCH. You’ve come to the right place.

This bug has to do with a mismatch in the “APC State Index”. It’s complicated, but it’s usually the result of a poorly-written driver that’s executing an asychronous procedure call (APC) incorrectly or too many times. It’s not necessary to understand what that means (and it would take several pages to explain), but you do need to know how to fix this Blue Screen if it comes up.

A Guide to the APC_INDEX_MISMATCH Blue Screen of Death Error
An example of this Blue Screen in Windows 7.

Windows 7 Hotfix

If you’ve got Windows 7, Microsoft has a hotfix available that fixes the problem immediately. A hotfix is a program that automatically corrects bugs in Windows. Users of other versions of Windows: continue reading.

New Hardware

If you’ve installed hardware recently, and used a driver that came on the enclosed disc or auto-installed when you plugged it in, this driver may be the culprit. Read on to find out how to get that driver updated.

Driver Issue

Sometimes the Blue Screen will identify the driver causing the problem. If not, you’ll have to try to update all the drivers you can to their latest versions, especially for the aforementioned new hardware. To do so:

  1. Click Start (Windows Key + X in Windows 8)
  2. Click Control Panel
  3. Click Device Manager
  4. Right-click on each device and click Update Driver

This process can be tedious and time consuming. Luckly, we’ve got Driver Reviver, which can scan your PC for outdated drivers, then update them all at once, with just a few clicks. Frequent use of Driver Reviver is great for reducing Blue Screens of Death like this one.

Kernel Issue

This BSoD can also happen due to bad system files. Go ahead and run an sfc /scannow from the Command Prompt. Here’s more information on how to run sfc /scannow.

Good luck!

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