Critical Bug Plagues Windows 11 February Update
Microsoft has officially acknowledged a severe bug affecting Windows 11 systems following the installation of the February 2026 Patch Tuesday update (KB5077181). Users are reporting that they can no longer access the system drive (C:), receiving an "Access is denied" error message that effectively cripples core system functionality.
Impact on Applications and Utilities
The issue extends far beyond simple file navigation. According to updated official documentation, the permission failure prevents popular applications—such as Microsoft Outlook, Office suites, and web browsers—from launching. Users are also unable to perform essential administrative tasks, elevate privileges, or even uninstall the problematic update.
Affected Devices and Scope
The bug appears targeted at specific hardware. Microsoft notes the issue is "predominantly observed" on Samsung Galaxy Book 4 and other Samsung consumer models. Reports have originated primarily from regions including Brazil, Portugal, Korea, and India. While the root cause is still being validated, early investigations suggest a conflict with the Samsung Share application.
Currently, only Windows 11 versions 24H2 and 25H2 are impacted. Users running older versions of the operating system or Windows 10 remain unaffected.
Recommended Actions
While some online forums suggest manually changing drive ownership as a workaround, this method carries significant risk for non-expert users. Microsoft is actively investigating the problem. For most affected users, the safest course of action is to wait for an official patch rather than attempting complex system modifications.
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