Microsoft Confirms Windows 11 Bug That Locks Users Out of the C: Drive
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March 14, 2026
submitted by throws_lemy to technology 504 points | 143 comments https://windowsreport.com/microsoft-confirms-windows-11-bug-that-locks-users-out-of-the-c-drive/
KB5077181 was released about a month ago as part of the February Patch Tuesday rollout. When the update first arrived, users reported a wide range of problems, including boot loops, login errors, and installation issues.
Microsoft has now acknowledged another problem linked to the same update. Some affected users see the message “C:\ is not accessible – Access denied” when trying to open the system drive.
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