Microsoft Fixes Windows 11 September Update Bugs With Emergency Patch After Reports of Crashes, Audio Failures and System Problems

Microsoft has released an emergency update for Windows 11 after its September 2026 update caused a number of problems for users. The company has issued an out-of-band Windows 11 update to address several bugs reported following the latest patch.

The September Windows 11 update introduced new features and security fixes, including patches for nearly 1,000 security issues. However, shortly after its release, some users began reporting problems with graphics, audio, File Explorer, backups, and Remote Desktop Services.

One of the more serious reported issues affects PCs equipped with AMD Radeon graphics cards. Some users have experienced crashes after installing the September Windows 11 update, with the problem believed to be related to driver instability. In certain cases, reinstalling the graphics driver has not resolved the issue.

Microsoft has not specifically mentioned AMD Radeon graphics cards in its notes for the emergency update, but the company has addressed several other problems reported after the September patch.

Windows 11 Audio and Remote Desktop Problems Fixed

The emergency Windows 11 security update also addresses problems affecting audio and microphone functionality. Some users reported that their speakers and microphones stopped working after installing the September update.

Others found that their audio devices were starting with incorrect settings, including unexpected changes to 3D audio and speaker configurations. Microsoft has now included a fix for this issue.

Another important fix addresses problems with Remote Desktop Services. The September update could make the service unstable, leading to connection and sign-in issues. This could be particularly disruptive for businesses, system administrators, and people who regularly manage remote computers.

The September update also introduced problems with File Explorer. In some cases, users encountered a black screen after signing into Windows, even though the operating system itself continued to function. Microsoft has also fixed an issue affecting File History, which could prevent Windows from detecting external storage drives used for backups. The emergency patch additionally addresses a problem affecting Claude Cowork, where the Windows update could cause certain Linux virtual machines using Plan9 shared folders to stop working properly.

Some HP and Lenovo PC owners have also reported serious issues connected to recent Windows 11 updates. Certain HP systems have reportedly experienced BIOS-related installation failures, while some Lenovo machines have encountered unexpected black screens or shutdowns. These problems are reportedly connected to issues that first appeared with the August update and continued after the September patch. Users with affected devices should check Microsoft's support information as well as updates from their computer manufacturer before installing additional patches.

Microsoft's faster Windows development cycle has brought more features and security fixes to users, but the latest problems also highlight how major Windows 11 updates can sometimes introduce new issues while attempting to fix existing ones.

This article is based on information from Tom's Hardware