acl corruption

Microsoft and Samsung have confirmed a dangerous interaction between a Samsung-supplied app and recent Windows 11 systems that in some cases leaves the operating system unable to access the C: system volume — users see the alarming message “C:\ is not accessible — Access denied” and are...

Microsoft’s March cumulative for Windows 11 has left a small but alarming trail: a subset of users—most visibly owners of recent Samsung Galaxy Book laptops—are reporting the error message “C:\ is not accessible — Access denied,” effectively preventing normal access to the system drive and...

Microsoft’s March cumulative update for Windows 11, KB5079473 (released March 10, 2026), is rolling out with a familiar mix of new features and security fixes — but a growing number of users now say the patch is also triggering severe instability on some machines, including hard freezes...