Samsung users are in tears over a C drive error on Windows 11.

Microsoft acknowledges that recovery capabilities for affected devices are currently "very limited".

While Microsoft is working to release security patches to address zero-day vulnerabilities, a segment of Samsung device users are facing a far more ironic situation: unable to access their own C: drive on their computers.

This unusual incident caused a large number of Galaxy Book and Samsung PCs to suddenly become completely unusable, as all access to important files and applications was denied.

When drive C: becomes a "stranger"

After installing the February 2026 security update (KB5077181), many Samsung device users began receiving the grim message: 'C: is not accessible – Access is denied' .

This error is so severe that users are unable to launch any applications, from the Office suite and Outlook to web browsers and system utilities. Even uninstalling updates or granting administrator privileges is blocked, rendering all attempts at troubleshooting at home futile.

Microsoft is not the culprit.

Although the bug appeared shortly after the Windows update, preliminary investigations from Microsoft and Samsung pointed to a surprising culprit: Samsung Galaxy Connect .

Specifically, the issue lies in a faulty access control list (ACL) management in Samsung's original operating system image. When the Galaxy Connect and Galaxy Share Folder apps automatically updated, they inadvertently "boxed in" the entire system drive. Currently, Microsoft has temporarily removed Galaxy Connect from the Store, while Samsung has also had to revert to an older version to prevent the bug from spreading to other devices.

What solutions are available for users who have already been affected?

Microsoft acknowledges that recovery capabilities for affected devices are currently "very limited ." While some methods for changing drive ownership are circulating on forums like Reddit and r/sysadmin, experts advise against attempting these methods on your own, as they could lead to serious long-term security vulnerabilities.

The models that are considered "at risk" include:

• Galaxy Book: NP750XGJ, NP750XGL, NP754XGJ, NP754XFG, NP754XGK.

• Samsung Desktop: DM500SGA, DM500TDA, DM500TGA, DM501SGA.

If you own one of the above models and still have access to the system, immediately uninstall or downgrade the Samsung Galaxy Connect app to a stable version. If the C: drive is locked, the best course of action is to patiently wait for the official fix from Samsung and Microsoft instead of attempting to deeply modify the system.