Windows 11 Bug Blocks Access to C: Drive on Select Samsung PCs
A Samsung app triggers a critical Windows 11 issue, locking users out of the C: drive and disrupting core system functions.
Key Takeaways:
- Some Samsung devices hit by a Windows 11 bug blocking C: drive access.
- This issue is traced to a Samsung app, not the latest Windows updates.
- Microsoft shares recovery steps for Windows 11 users.
A newly surfaced Windows 11 bug is locking users out of their systems and blocking access to the critical C: drive on select Samsung devices. The company has issued official guidance for affected systems running Windows 11 versions 24H2 and 25H2.
According to Microsoft, users are encountering a “C:\ is not accessible – Access denied” error when launching apps such as Office, web browsers, and tools like Quick Assist. The issue appears after installing the February 2026 security update (KB5077181), which leaves affected systems unable to access the C: drive.
Microsoft also noted that affected users cannot access files on the C: drive or carry out key administrative tasks. In some cases, the issue even blocks users from uninstalling updates, viewing certain system logs, or elevating their access privileges.
“While the reports coincided with recent March Patch Tuesday timing, investigation confirmed the issue is not caused by current or previous Windows monthly updates. The issue has been observed on Samsung Galaxy Book 4 and Samsung Desktop models running Windows 11, versions 24H2 and 25H2, including NP750XGJ, NP750XGL, NP754XGJ, NP754XFG, NP754XGK, DM500SGA, DM500TDA, DM500TGA, and DM501SGA,” Microsoft explained.
Samsung Galaxy Connect App linked to a critical system issue
Microsoft and Samsung have identified the Samsung Galaxy Connect app as the root cause of the issue on Windows 11 PCs. Microsoft has temporarily removed the app from the Microsoft Store, while Samsung has rolled it back to a previous stable version to prevent it from impacting additional devices.
For PCs that were already impacted, Microsoft released a detailed recovery process that requires signing in with an administrator account, uninstalling the Samsung app, temporarily modifying drive permissions, and running a batch repair file to restore Windows’ default security settings. Users who are unable to complete the recovery steps are advised to contact Samsung Support directly and reference the C: drive access issue linked to the Galaxy Connect app.
Rabia has a master's degree in Software Engineering and she has years of experience writing professionally about Microsoft products and other technologies. Rabia has also written for OnMSFT.com as well as Windows Report. She is always up to date on t...
