Windows 11 26H2 Crashing Games? How to Fix It (KB5124010)

If windows 11 26h2 crashing games is the problem you are dealing with after the latest update, you are not alone. Microsoft has confirmed that the September 2026 preview update KB5124010 can crash some games and apps, and the company says a fix is coming in a future Windows update. Until that patch arrives, here is what is happening and how to fix it.

What Is KB5124010?

KB5124010 is the September 22, 2026 preview update for Windows 11. It is an optional, non-security update that applies to versions 26H2, 25H2, and 24H2. After installing it, Windows 11 26H2 moves to OS build 26300.9550, while 25H2 goes to 26200.9550 and 24H2 to 26100.9550. Microsoft notes that this is the final preview update for Windows 11 version 24H2. Because the three versions share servicing, the same update, and the same bugs, land on all of them at once.

Known Issues: Why Games Keep Crashing

Microsoft has acknowledged the following problems after installing KB5124010:

• Apps and games that use AC-3 audio decoding can close unexpectedly. This is the big one. Microsoft says how often it happens depends on what the app does. Some apps crash outright, while others work normally until they try to play audio. The company adds that most modern apps should be unaffected, but the issue is confirmed and real.
• Black screen or desktop loading problems after signing in.
• Loss of the domain trust relationship on some devices.
• USB Audio Class 1.0 devices may stop producing sound and show a Code 10 error. Microsoft treats this as separate from the AC-3 game crashes.

September 2026 was a rough month for Windows 11 overall. The September 8 update (KB5124008) introduced new features like a movable taskbar, a resizable Start menu, and Bing-free Windows Search. Then an emergency out-of-band update (KB5129195, released September 14) fixed broken Remote Desktop connections and WSL folder sharing. KB5124010 was meant to calm things down, but it introduced the crashing bug instead.

How to Fix Windows 11 26H2 Crashing Games

Work through these fixes in order, starting with the least disruptive.

1. Check for the Follow-Up Patch First

Microsoft says it is “working on releasing a resolution for this issue in a future Windows update.” Before you uninstall anything, open Settings, go to Windows Update, and click Check for updates. If Microsoft has shipped the fix, installing it is the cleanest solution.

2. Uninstall KB5124010

If no fix is available yet, removing the update stops the crashes for most people. Here is how:

1. Open Settings and go to Windows Update.
2. Click Update history.
3. Click Uninstall updates.
4. Find KB5124010 in the list, click Uninstall, and restart your PC when prompted.

Advanced users can also remove it from an elevated Command Prompt with this command: wusa /uninstall /kb:5124010

3. Pause Windows Updates

After uninstalling, stop Windows from reinstalling the same bad update right away. In Settings, go to Windows Update and use the Pause updates option to pause for up to five weeks. This buys time for Microsoft to release the proper fix.

4. Roll Back to the Previous Build

If you upgraded to 26H2 recently and the whole system feels unstable, you can go back. Within 10 days of the upgrade, open Settings, go to System, then Recovery, and choose Go back. Follow the prompts to return to your previous version of Windows 11.

5. Try Audio and Driver Workarounds

Because the crash is tied to AC-3 (Dolby Digital) audio decoding, a few targeted steps may help: update your audio and graphics drivers from the manufacturer’s website, try a different audio output device, and turn off audio enhancements under Settings, System, Sound. If you use a headset or microphone for gaming, our guide to troubleshooting microphone privacy settings in Windows 11 may also help. Gamers can also look at Xbox Mode on PC for a smoother gaming setup. And before making major system changes, make sure your Microsoft account is linked to your digital license.

What to Do If Nothing Works

If games still crash after uninstalling KB5124010, the problem may lie elsewhere. Open Command Prompt as an administrator and run sfc /scannow to repair corrupted system files. Reinstall the affected game, check the game’s support forums for patches, and make sure your GPU drivers are current. As a last resort, back up your files and use Settings, System, Recovery to reset Windows while keeping your files.

The Bottom Line

KB5124010 brought a confirmed game-crashing bug to Windows 11 26H2, but Microsoft is working on a fix. Until it arrives, uninstalling the update and pausing Windows updates is the safest workaround to stop the crashes.

Sources: Windows Latest, Neowin, Microsoft Support