The latest cumulative update for Windows 11, KB5121003, released on August 11, has caused headaches for many gamers. Since its installation, numerous users have reported unexpected crashes, freezes, and even complete system restarts when attempting to run certain games. Interestingly, the problem doesn't stem from the operating system or the games themselves, but from something far more noticeable: the RGB lighting of peripherals and internal components.
Microsoft has officially confirmed that the problem is related to the drivers installed by LED lighting management programs. Specifically, the inpoutx64.sys file is the prime suspect—a low-level driver that many lighting applications use to communicate with the hardware. After the update, this driver conflicts with certain games and causes errors such as the dreaded EXCEPTION_ACCESS_VIOLATION.
Which games are affected and why?
The titles most frequently cited by the community are ARC Raiders, The Finals, and Marvel Tokon: Fighting Souls . Players have reported that when launching these games, the system crashes, the screen freezes, or the PC restarts unexpectedly. In some cases, these crashes occur up to six times in a single session, generating a wave of complaints on forums and social media.
The technical conflict stems from the privilege level at which this driver operates. inpoutx64.sys accesses the system kernel, a restricted area where normal programs shouldn't be allowed. Anti-cheat systems in games, like those used in these titles, detect these types of drivers as potentially dangerous and block them. The problem is that the RGB software continues to attempt to communicate with the hardware, and this conflict causes the system to crash.
Microsoft has explained that the problem isn't with the RGB hardware itself, but with the drivers installed by lighting management applications. Many motherboard, fan, memory, and peripheral manufacturers include this file in their software, so the list of affected devices is quite extensive. Regardless of the brand or model, if the software uses inpoutx64, there's a risk of conflict.
The temporary solution proposed by Microsoft
While a permanent solution is being investigated, Microsoft has published an official recommendation: disable the inpoutx64 driver from the Windows Registry. The process involves accessing the key HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\inpoutx64 and changing the value of Start to 4, which prevents the driver from loading at system startup. Afterward, the computer must be restarted for the changes to take effect.
The company warns that modifying the Registry carries risks, so it recommends making a backup before making any changes. Furthermore, disabling this driver can cause RGB lighting functions to stop working or prevent the management software from recognizing the devices. In other words, the user will have to choose between having colorful lights or being able to play without any issues.
Embark Studios, the studio behind ARC Raiders and The Finals, has also shared a manual method for removing the problematic driver. The steps are simple: open Command Prompt as administrator, run the commands `sc stop inpoutx64` and `sc delete inpoutx64` , and then delete the file `C:\Windows\System32\drivers\inpoutx64.sys` . Upon restarting, the driver will no longer be present, and the games should function normally again.
Recommendations and alternatives for those affected
Experts recommend applying this solution only to computers where the conflict has already occurred. It is not advisable as a preventative measure, as it could affect other programs that depend on this driver to function correctly. If the computer is not experiencing problems, it is best to leave it alone and wait for Microsoft to release a permanent patch.
For those who don't want to give up RGB lighting, there are alternatives like SignalRGB or OpenRGB , programs that manage lighting without using low-level drivers. These tools have stricter permission lists and don't usually conflict with anti-cheat systems. However, you should check that they are compatible with the devices you have at home.
Microsoft has confirmed it is continuing to investigate the relationship between these RGB components and the games that trigger the issue. The problem officially affects Windows 11 versions 24H2 and 25H2, and there is currently no announced date for a permanent fix. The company is asking users to report any issues through the Feedback Hub to prioritize the investigation.
This incident once again highlights a recurring problem in Windows: the enormous diversity of hardware and software coexisting in the system means that any update can trigger unexpected effects. The combination of an outdated driver, a strict anti-cheat system, and an operating system update has been enough to leave many gamers unable to enjoy their favorite titles.
Meanwhile, those affected will have to choose between keeping the RGB lighting or being able to play without interruptions. Microsoft's solution is clear: disable the driver and wait for a permanent patch. Until then, patience and backups will be gamers' best allies.
