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Windows Insider Canary Build 26340.9750 – Explorer.exe crashes on sign-in, leaving desktop unavailable
Category: Windows Insider Program → Desktop Environment / File Explorer
Affected build: Windows 11 Insider Preview 26340.9750
Previously working build: 26340.9616
Date: October 16, 2026
Affected machines: DELTA-V11 and DELL-14 1. Problem description
After installing Windows Insider Preview build 26340.9750, the Windows desktop fails to appear after signing in.
The issue has been observed on two separate computers, DELTA-V11 and DELL-14.
On DELTA-V11:- The desktop and taskbar do not initialize successfully.
- Ctrl+Alt+Delete remains functional.
- Task Manager can be launched.
- CMD and PowerShell 7 can run, including with administrative privileges.
- Manually starting explorer.exe causes the process to terminate after a few seconds.
- The issue occurs with different user accounts.
- Removing the previously configured HKCU\Software\Microsoft\Windows\CurrentVersion\Exp lorer\Serialize registry key and restarting Windows did not resolve the problem.
Windows Application Event Log, Event ID 1000:Repeated crashes were recorded on October 16, 2026, at:Faulting application Explorer.EXE Application version 10.0.26100.9750 Faulting module SettingsHandlers_DesktopTaskbar.dll Module version 10.0.26100.9750 Exception code 0xc0000409 Fault offset 0x000000000003a274 Module path V:\Windows\System32\SettingsHandlers_DesktopTaskba r.dll - 20:03:59
- 20:06:08
- 20:06:39
- 20:22:56
All four events identify the same faulting module, exception code and offset.
The exception code may indicate a fail-fast termination. Its precise cause has not yet been determined. 3. Attempted rollback and servicing failure
The installed cumulative update package was identified as:
Package_for_RollupFix~31bf3856ad364e35~amd64~~2610 0.9750.1.4
KB: KB5127842
The previous package, version 26100.9616.1.1, was listed as superseded.
The initial rollback attempt used:
Remove-WindowsPackage -Online -PackageName 'Package_for_RollupFix~31bf3856ad364e35~amd64~~261 00.9750.1.4' -NoRestart
The operation failed with:
Permanent package cannot be uninstalled due to container dependency.
CBS.log reported:
Container base layer depends on LCU version greater than
'10.0.26100.9750'.: 800f0926
CBS_E_CANNOT_REMOVE_CONTAINER_DEPENDENCY
The rollback was therefore blocked during CBS dependency validation.
Additionally, DISM /Online /Get-OSUninstallWindow returned error 2 (file not found). Windows Recovery Environment was not available on this particular machine due to a separate pre-existing issue. 4. Successful workaround
The following optional Windows features were disabled from an elevated PowerShell session:
Disable-WindowsOptionalFeature -Online -FeatureName Containers-DisposableClientVM -NoRestart
Disable-WindowsOptionalFeature -Online -FeatureName Containers-Server-For-Application-Guard -NoRestart
After a complete system restart, both features were confirmed as Disabled.
The same Remove-WindowsPackage command was then executed again.
This time, the previous immediate container-dependency error did not occur, and the rollback completed successfully.
After restarting, DELTA-V11 returned to:
Microsoft Windows Version 10.0.26340.9616
The normal desktop and Windows Settings interface were restored.
This strongly associates the desktop failure with the installation of build 26340.9750, although the exact root cause remains undetermined.
The successful rollback also suggests that the enabled container-related features contributed to the servicing dependency preventing update removal. The individual contribution of each feature was not isolated. 5. Expected behavior
Explorer.exe should initialize normally after signing in, presenting the desktop, taskbar and notification area.
The system should also support removal of an uninstallable cumulative update without unexplained container-layer dependency failures. 6. Actual behavior- Explorer.exe repeatedly terminates during desktop initialization.
- No usable Windows desktop is presented.
- The issue is not limited to one user profile.
- The initial rollback attempt fails with CBS error 0x800f0926.
- Disabling Windows Sandbox and Container Server, followed by a restart, allows rollback to proceed.
Please investigate:- A possible regression in SettingsHandlers_DesktopTaskbar.dll version 10.0.26100.9750, particularly around offset 0x3A274.
- The repeated Explorer.exe fail-fast exception 0xC0000409 during desktop initialization.
- The CBS container base-layer dependency check that prevents removal of KB5127842 while the specified container-related optional features are enabled.
- Whether these issues are known in Windows Insider Preview build 26340.9750.
Application Event Logs, CBS.log extracts and additional diagnostic traces can be provided if required.
Additional observation: A second computer, DELL-14, exhibits the same missing-desktop symptom after updating to build 26340.9750. The exact faulting module and exception details have not yet been confirmed on that computer.
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