Microsoft has rushed out an emergency Windows 11 update — KB5129195 — to clean up a wave of problems caused by the September 2026 Patch Tuesday release. The out-of-band patch went live September 14 and installs automatically, but several of the most disruptive issues, including AMD Radeon GPU crashes, complete audio loss, and File History failures, are not fixed.
What KB5129195 actually fixes
Microsoft has released an out-of-band update to address several problems caused by the Windows 11 September 2026 security updates. The issues include Hyper-V Linux folder sharing failures, Remote Desktop problems, and USB audio failures.
One of the biggest problems caused by the September update involved Remote Desktop Services (RDS). On affected systems, Remote Desktop connections could fail after several minutes, users could encounter sign-in problems, or systems could become stuck at the "Please wait for the Remote Desktop Configuration" screen. That hit small businesses hardest, since Remote Desktop is how many owners and IT contractors get into office PCs from home.
On the audio side, the fix is only partial. Microsoft noted that 8-channel and 3D audio modes are being fixed, but several other issues remain. For example, the lack of volume controls and the complete lack of audio output are still present for some USB audio devices, so this release doesn't completely fix the problem.
What's still broken after installing it
Several of the most disruptive complaints remain unresolved, including AMD Radeon crashes and Explorer failing to load. PCs with Radeon RX 6600, RX 7700 XT, RX 7800 XT, RX 7900 GRE, RX 7900 XTX, and RX 9070 XT GPUs can still experience black screens, freezes, or driver timeouts. Microsoft has not attributed a fix to this in the emergency update, and rolling back GPU drivers hasn't helped affected users. If you have a gaming rig with a recent Radeon card, this is the one to watch — a shop that handles gaming PC diagnostics and GPU issues can help you figure out whether the crashes are the update, the driver, or the card itself.
File History is also still misbehaving. The backup feature still fails to detect connected external drives on affected systems, and KB5129195 doesn't change that. If you were relying on File History to protect family photos or business records to an external drive, assume those backups are not running right now and verify manually. If a drive itself has stopped mounting, that's a separate issue we can look at through professional drive recovery.
There are also reports of desktop-level failures on some machines. Windows Latest has received reports of Explorer.exe failing to start or crashing almost immediately after you sign in, leaving some PCs stuck on a black screen without a working desktop or taskbar. So far, these reports mostly involve enterprise environments using Citrix UPM, FSLogix, Horizon, or ProfileUnity ProfileDisks, and both Windows 11 24H2 and 25H2 appear to be affected.
Should you install it?
Yes — for most home and small-business users, the answer is install it. KB5129195 is a mandatory, cumulative out-of-band update, which means it includes fixes from previous releases, including the September 2026 Patch Tuesday update. It advances Windows 11 25H2 to Build 26200.9457 and version 24H2 to Build 26100.9457.
Microsoft has also included additional protections related to CVE-2026-62721, an elevation-of-privilege vulnerability affecting the Windows User-Mode Power Service. That makes KB5129195 more significant than a simple bug-fixing patch. Users get the emergency compatibility and reliability fixes alongside an additional security improvement.
To check, open Settings → Windows Update and look for the September 2026 out-of-band update, or verify the build number under Settings → System → About.
One warning: rolling back the September update to escape the AMD or File History bugs is risky. Removing KB5124008 may fix File History or graphics problems, but doing so also removes important security protections. If your machine is unusable after the update and you need it working today, bring it in rather than trying an uninstall blind — walk-in desktop and laptop diagnostics can sort out whether a rollback, a driver fix, or something else is the safer play.
What This Means for York, PA
York-area customers running Windows 11 on 24H2 or 25H2 — especially anyone with a recent AMD Radeon card, a USB audio interface, or a File History backup drive — should check their update status this week. If your PC has been freezing, black-screening, or losing sound since Patch Tuesday, York Computer Repair at 2069 Carlisle Rd is open Monday through Friday 9-5 and can diagnose whether it's the update or something deeper.
Sources
- Microsoft Releases KB5129195 Out-of-Band Update to Fix Issues Triggered by Windows 11 September 2026 Patch
- Windows 11 KB5129195 is out after Microsoft confirms major issues with the September 2026 update, but it won't fix AMD GPU errors
- Microsoft issues emergency Windows 11 patch to fix Remote Desktop and audio, but not AMD GPU crashes
- Windows 11 and 10 get emergency patches, but AMD GPU issues remain
- Windows 11 KB5129195: What It Fixes and Doesn't
- Windows 11 KB5129195 Emergency Update Fixes Major September Update Problems