Microsoft’s newest cumulative replace for Home windows 11, KB5066835, is inflicting important disruptions for customers, most notably by rendering USB keyboards and mice ineffective inside the Home windows Restoration Setting (WinRE).
The patch, launched on October 14, 2025, impacts Home windows 11 variations 24H2 and 25H2, together with Home windows Server 2025, making a important roadblock for system troubleshooting and restore.
The first difficulty surfaces when customers try and enter WinRE, a vital mode for fixing boot failures, resetting a PC, or restoring from a backup.
Whereas enter units operate usually throughout an ordinary Home windows session, they turn out to be utterly unresponsive within the restoration atmosphere.
This leaves customers unable to navigate menus or execute instructions, successfully locking them out of important restore instruments.
- Customers report keyboards and mice are totally useful within the working system however cease responding solely when booted to WinRE.
- Consequently, accessing choices like “System Restore,” “Startup Restore,” or “Reset this PC” turns into unattainable with out working USB peripherals.
Microsoft formally acknowledged the bug on October 17, 2025, confirming widespread studies from customers who discovered themselves stranded throughout troubleshooting makes an attempt.
For IT directors, this bug poses a severe threat, as it may well flip minor server points into main downtime occasions if restoration instruments are inaccessible.
The issues with KB5066835 don’t finish with WinRE. Customers throughout boards and social media have reported a cascade of different points since putting in the replace.
Community diagnostics have revealed that localhost connections are failing, hindering native utility growth and testing.
- File Explorer’s preview pane often hangs or shows clean home windows, negatively impacting workflow effectivity.
- Many customers spotlight sluggish system efficiency, with delayed app launches and unpredictable multitasking famous throughout numerous {hardware} profiles.
Moreover, many customers have skilled set up failures accompanied by cryptic error codes, forcing them to manually roll again the replace.
Productiveness has additionally taken successful, with studies of File Explorer’s preview pane changing into unresponsive and common system sluggishness, together with delayed app launches and erratic multitasking efficiency on units starting from shopper laptops to enterprise servers.
In response to the rising complaints, Microsoft has confirmed it’s growing a repair, which is anticipated to be launched within the coming days. Within the meantime, the corporate advises customers to keep away from getting into WinRE if potential.
For many who should carry out a system restoration, the really useful workaround is besides from separate set up media the place peripherals are anticipated to work appropriately.
As a final resort, affected customers can uninstall KB5066835 by the “View replace historical past” part in Settings. Nevertheless, this motion will take away the newest safety patches, leaving the system susceptible. Customers are suggested to observe Microsoft’s official channels for the forthcoming repair.
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