Windows 11 KB5121003 Game Crashes: How to Fix ARC Raiders, The Finals & RGB Driver Issues
Windows 11 KB5121003 was linked to crashes and unexpected restarts in a small but important group of gaming PCs. The problem affected some systems running RGB-control software that installed a kernel driver or component with a filename similar to inpoutx64.
Microsoft has now marked the issue as resolved. The fix blocks the affected driver from loading on eligible consumer and business devices, and the fix is being delivered automatically. Microsoft says the rollout can take up to 24 hours from August 26, 2026, 6 PM PT.
inpoutx64-type driver. If the automatic Microsoft fix has not reached your PC yet, the temporary registry workaround can prevent the conflict.
What Happened With Windows 11 KB5121003?
KB5121003 is the August 11, 2026 security update for Windows 11 24H2 and 25H2. On affected systems, certain games could stop responding, close unexpectedly, show an EXCEPTION_ACCESS_VIOLATION error, or cause the PC to restart. Microsoft initially investigated the issue as a Windows update-related problem, but its final investigation found that the trigger was associated with RGB-enabled peripherals or internal components and their installed drivers.
The important detail is the inpoutx64 component. It can be installed by RGB-control software and can operate at a low system level. When the affected driver was present, launching certain games could trigger the crash.
| Item | Details |
|---|---|
| Windows update | KB5121003 |
| Release date | August 11, 2026 |
| Windows versions | Windows 11 24H2 and 25H2 |
| Builds | 26100.9168 and 26200.9168 |
| Problem component | RGB-related driver/component with a filename similar to inpoutx64 |
| Current Microsoft status | Resolved; automatic driver block is rolling out |
Which Games Were Affected?
Microsoft's release-health documentation identifies three games in the reported issue:
- ARC Raiders
- MARVEL Tōkon: Fighting Souls
- THE FINALS
The symptoms were not identical on every PC. Some users saw the game freeze or close, while others reported an EXCEPTION_ACCESS_VIOLATION error or an unexpected restart. Microsoft says the issue was resolved for THE FINALS by Embark Studios, while the Windows-side driver block was used to address the affected configuration.
Signs That Your PC Is Affected
You should investigate the RGB-driver conflict if several of these happened after installing KB5121003:
- A supported game suddenly stopped launching or became unresponsive.
- The game closes immediately after starting.
- You see
EXCEPTION_ACCESS_VIOLATION. - The PC unexpectedly restarts when the game launches.
- The problem is limited to certain games while other games work normally.
- Your system uses RGB-control software or RGB-enabled hardware.
How to Check for the inpoutx64 Driver
If you want to verify whether the affected driver exists on your PC, open Command Prompt as administrator and run:
sc query inpoutx64
If Windows reports that the service exists, you have a reason to investigate the RGB software or hardware that installed it. If the service is not found, this particular workaround is unlikely to be relevant to your crash.
You can also check installed RGB utilities and hardware-control applications. Look for software that manages motherboard lighting, keyboard lighting, mouse lighting, fans, or other RGB devices.
How to Fix Windows 11 KB5121003 Game Crashes
1. Install the automatic Microsoft fix first
This is the preferred option for most users. Microsoft has released a compatibility block that prevents the affected inpoutx64 driver from loading on eligible systems. The fix is rolling out automatically and requires a restart. Microsoft says it may take up to 24 hours to reach all affected unmanaged devices.
Restart Windows after receiving the fix, then test the affected game again.
2. If the fix has not arrived, use Microsoft's temporary registry workaround
Microsoft's documented workaround is to temporarily disable the inpoutx64 driver through the Windows Registry. Before changing the Registry, create a backup so you can restore the previous setting if needed.
- Press Windows + R.
- Type
regeditand press Enter. - Go to:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\inpoutx64
- Find the Start value.
- Open it and change the value data to 4.
- Close Registry Editor.
- Restart the PC.
3. Update the RGB-control software
After the PC is stable, check the official support page for the software that controls your RGB hardware. Install a current version if one is available. The goal is to remove the old driver dependency rather than permanently leaving a hardware-control component disabled.
4. Restart and test before changing other Windows settings
Avoid changing several unrelated settings at once. Restart Windows, launch the affected game, and check whether the crash is gone. This makes it much easier to identify what actually solved the problem.
Is Microsoft Still Investigating KB5121003?
Microsoft's Windows release-health page now lists the issue as resolved as of August 26, 2026. Microsoft says the resolution blocks the affected driver from loading and is propagating automatically to unmanaged consumer and business devices. The same driver block is also planned for the September 2026 security updates and later releases.
If you manage PCs through an organization, the automatic resolution may not propagate in the same way. Microsoft's release-health documentation says IT administrators can use the documented workaround for enterprise-managed devices.
Should You Uninstall KB5121003?
Not for this particular problem if the Microsoft driver block is already reaching your PC. The issue has been resolved at the compatibility-driver level, so removing a security update is not the first choice.
KB5121003 remains an important security update for Windows 11 24H2 and 25H2. If you are experiencing a completely different problem after the update, troubleshoot that specific symptom rather than automatically removing the update.
For the official update record, you can check Microsoft's Windows release-health documentation and Microsoft Update Catalog.
How to Prevent Similar RGB Driver Problems
- Keep motherboard and peripheral-control software updated.
- Remove RGB utilities you no longer use.
- Avoid installing multiple programs that try to control the same RGB hardware.
- After a major Windows update, test your main games before changing several system settings.
- If a game suddenly crashes after an update, check Windows release-health notices before reinstalling Windows or replacing hardware.
Windows 11 KB5121003 August 2026 Update Guide
Windows 11 26H2 Gaming Optimization: Fix Lag and Boost FPS
Windows 11 26H2 High CPU Usage Fix
Fix Windows 11 26H2 High RAM Usage and Memory Leaks
NVIDIA RTX 5060 Review: 8GB VRAM for 1080p Gaming
FAQ
Did Windows 11 KB5121003 directly cause the game crashes?
Microsoft's final investigation says the issue was related to RGB peripherals or internal components that installed an inpoutx64-type driver. The update exposed the compatibility problem, but Microsoft says the Windows update itself was not the root cause.
What is inpoutx64?
It is a low-level driver/component name associated with some RGB-control software and hardware configurations. On affected systems, its presence could trigger the reported game compatibility problem.
Which games were affected?
Microsoft lists ARC Raiders, MARVEL Tōkon: Fighting Souls, and THE FINALS in its release-health documentation for this issue.
Should I uninstall KB5121003?
Not as the first step for this specific issue. Microsoft has marked the RGB/inpoutx64 problem as resolved and is rolling out a driver block automatically.
What if the game still crashes after the Microsoft fix?
Then the crash may have another cause. Check GPU drivers, game files, anti-cheat components, overlays, and other recently installed software instead of assuming KB5121003 is still responsible.
Last checked: August 28, 2026. Windows update behavior can change as Microsoft expands the compatibility fix.
