Microsoft identified the reason for issues accessing drive C on Samsung laptops – it’s not caused by a Windows 11 update.

Short news summary

After users began complaining about a lock on drive C after installing the Windows 11 update in March, Microsoft discovered that the cause was not the OS itself but Samsung‑OEM software. The problem existed before the March patch and appeared on some models after installing the February security update (KB5077181) and subsequent fixes.

Who is affected?

- Laptop models: Samsung Galaxy Book 4

- NP750XGJ, NP750XGL, NP754XGJ, NP754XFG, NP754XGK

- Samsung desktops:

- DM500SGA, DM500TDA, DM500TGA, DM501SGA

All run Windows 11 (versions 24H2 and 25H2).

What’s happening?

After installing Samsung Galaxy Connect proprietary software, users encounter restrictions:

- Inability to open files or launch programs.
- Difficulty performing administrative tasks, uninstalling updates, or collecting logs due to access errors.

In some cases, it is even impossible to elevate privileges.

How to fix the issue?

1. Uninstall the current version of Galaxy Connect – the app was temporarily removed from the Microsoft Store.
2. Install the stable previous version – Samsung released it specifically to prevent the error from reoccurring.
3. Follow Microsoft’s official guide: “Recovery steps: Samsung Galaxy Connect or Samsung Continuity Service can cause loss of access to drive C.”

After following the instructions, access to drive C should be restored.

Thus, the lock is not related to Windows but caused by a third‑party OEM application. Users whose devices are on the list now have a concrete action plan to resolve the problem.