A fresh Windows 11 bug is causing serious headaches for some PC owners, and Samsung laptop users appear to be bearing the brunt of it. Microsoft has confirmed reports that certain devices running recent Windows 11 builds can suddenly lose access to the system drive after installing a February 2026 security update.
MicrosoftWhen the issue triggers, users see the error message “C: is not accessible – Access denied”, effectively locking them out of the drive where Windows and most applications reside. The company says it is actively investigating the issue and working with Samsung to determine the root cause. For affected users, though, the problem can render their machines partially unusable.
Why are Samsung laptops being hit the hardest?
According to Microsoft’s release health documentation, the issue has been reported mainly on Samsung consumer devices such as the Galaxy Book 4 series running
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