Owners of Samsung Galaxy Book laptops are facing serious issues following a recent Windows 11 update from Microsoft. The update has led to significant problems, including the loss of access to the crucial C drive. Users are encountering an error message stating “C:is not accessible – Access denied,” preventing them from opening files and running certain applications like Microsoft Outlook and Office apps.
Several model numbers are believed to be affected by this issue, including NP750XGJ, NP750XGL, NP754XGJ, NP754XFG, NP754XGK, DM500SGA, DM500TDA, DM500TGA, and DM501SGA.
Microsoft has acknowledged the issue, stating that some Samsung devices are losing access to the C drive after installing the February 2026 security update (KB5077181) and subsequent updates. Users are experiencing difficulties accessing files and launching various applications due to the error message “C: is not accessible – Access denied.”
The problem seems to be linked to Samsung’s Galaxy Connect app, which facilitates functions like screen mirroring and file sharing between Galaxy smartphones and Windows computers. The app has been temporarily removed from the Windows app store while a solution is being developed.
Although a fix timeline is unclear, Samsung PC owners are advised to hold off on updating to Windows 11 versions 24H2 and 25H2. Those already on these versions should refrain from making any changes until further updates are released. Recovery options for affected devices are limited, and Samsung is collaborating with Microsoft to address the issue.
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