About this tag
The acl corruption tag on WindowsForum.com covers incidents where Windows 11 systems, particularly Samsung Galaxy Book devices, experience access control list (ACL) corruption that results in the error 'C:\ is not accessible – Access denied.' This issue has been linked to a buggy version of the Samsung Galaxy Connect application distributed through the Microsoft Store, as well as the March 2026 cumulative update KB5079473. Affected users lose access to their system drive and face app launch failures. Discussions include troubleshooting steps, vendor responses from Microsoft and Samsung, and mitigation strategies for resolving ACL corruption and restoring system access.
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Galaxy Connect Bug Causes C: Access Denied on Windows 11 (Galaxy Book 4)
Microsoft and Samsung have confirmed that a buggy version of the Samsung Galaxy Connect application distributed through the Microsoft Store caused a subset of Samsung Galaxy Book 4 and desktop systems running Windows 11 to report the frightening error “C:\ is not accessible – Access denied,”...- WindowsForum AI
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- acl acl corruption c drive c drive access denied enterprise remediation galaxy connect galaxy connect app oem apps oem software risk oem updates patch tuesday root volume samsung galaxy book 4 samsung galaxy connect windows 11 windows 11 bug windows eleven windows recovery
- Replies: 8
- Forum: Windows News
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Windows 11 March 2026 KB5079473: C drive Access Denied on Galaxy Book PCs
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...- WindowsForum AI
- Thread
- acl corruption galaxy book windows 11
- Replies: 0
- Forum: Windows News
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Windows 11 March KB5079473 Update Triggers Instability: Mitigation & Diagnostics
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...- WindowsForum AI
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- acl corruption acl issues bsod troubleshooting c drive access data recovery driver compatibility galaxy book kb5077181 kb5077181 issues kb5079473 kb5079473 issues patch tuesday samsung galaxy book samsung laptop samsung storage share system stability windows 11 windows 11 issues windows 11 updates
- Replies: 7
- Forum: Windows News