Microsoft is currently delving into a pressing issue that has surfaced for some Samsung laptops operating on Windows 11, particularly following the installation of the February 2026 security updates. Users are reporting a troubling loss of access to their C: drive, which in turn hampers their ability to launch essential applications.
Collaboration with Samsung
The tech giant is collaborating closely with Samsung to ascertain whether the root of the problem lies within the Windows updates themselves or if it is linked to specific Samsung software present on the affected devices. Microsoft elaborates on the situation, stating, “Users might encounter the error, ‘C: is not accessible – Access denied’, which prevents access to files and blocks the launch of some applications including Outlook, Office apps, web browsers, system utilities, and Quick Assist.”
This issue appears to manifest during routine usage of Windows on Samsung devices, affecting various tasks such as accessing files, launching applications, or executing administrative functions. In certain instances, users may find themselves unable to elevate privileges, uninstall updates, or even access crucial logs due to these permission-related problems.
Geographic Impact
The reports of this issue have predominantly emerged from Brazil, Portugal, South Korea, and India, with the Samsung Galaxy Book 4 and other consumer devices from the brand being primarily impacted. Microsoft’s ongoing investigation indicates a potential link to the Samsung Share application, although the definitive cause remains unverified at this time.
Currently, the issue seems confined to systems running Windows 11 versions 25H2 and 24H2. While Microsoft has yet to provide a temporary solution, a Reddit user, who claims to be a Samsung technician based in Brazil, has shared a workaround that some users have found helpful in restoring access to the C: drive.
Workaround Caution
This workaround involves altering the ownership of the entire C: drive and all its subfolders to the “Everyone” group, which includes system directories and files typically owned by TrustedInstaller or SYSTEM. However, it is crucial to note that modifying the ownership of system files in this manner compromises Windows’ inherent security measures. Therefore, users are strongly advised to refrain from implementing this workaround unless absolutely necessary, and instead, await an official resolution from Microsoft.
