If you are a Samsung Galaxy Book owner facing sudden critical issues, you are not alone. Following a recent Windows 11 update by Microsoft, some users are experiencing severe problems, including losing access to the essential C drive. Many users have encountered an error message stating “C: is not accessible – Access denied.”
This access restriction prevents affected individuals from opening files or running certain applications like Microsoft Outlook, Office apps, and specific web browsers. The problem seems to impact various model numbers, including NP750XGJ, NP750XGL, NP754XGJ, NP754XFG, NP754XGK, DM500SGA, DM500TDA, DM500TGA, and DM501SGA.
Microsoft has acknowledged the issue, stating, “Microsoft has received reports of some Samsung device models losing access to the C: drive after installing the February 2026 security update (KB5077181) and subsequent updates.” Users may encounter the error message mentioned earlier, which restricts file access and hinders the launch of applications like Outlook, Office apps, web browsers, system utilities, and Quick Assist.
The problem is believed to be linked to Samsung’s Galaxy Connect app, which facilitates functions such as screen mirroring, file sharing, and data transfer between Galaxy smartphones and Windows PCs. The app has been temporarily removed from the Windows app store while a solution is being developed.
Microsoft mentioned, “The affected Samsung Galaxy Connect application was temporarily removed from the Microsoft Store to prevent further installations. Samsung has reissued a stable previous version of the application to prevent additional device issues. Recovery options for affected devices are limited, and Samsung is working with Microsoft to explore potential solutions.”
The timeline for a fix remains uncertain. If you own a Samsung PC and have not updated to Windows 11 versions 24H2 and 25H2, it is advisable to delay the update. Users on Windows 11 versions 24H2 and 25H2 are recommended to retain their current settings.