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Microsoft Confirms Windows 11 24H2/25H2 Bug Blocks Access to the System Drive C

Microsoft has identified a critical issue affecting Windows 11 users on select Samsung devices, resulting in the inaccessibility of the system drive (C:) following the installation of the February 2026 security update. The company is collaborating with…

ABy Adam FosterMar 14, 20261 min read

Microsoft has identified a critical issue affecting Windows 11 users on select Samsung devices, resulting in the inaccessibility of the system drive (C:) following the installation of the February 2026 security update. The company is collaborating with Samsung to resolve the issue.

The problem arises after the application of the February 2026 Patch Tuesday update (KB5077181, OS Build 26100.7840) when affected Samsung devices display the error message: "C:\ is not accessible – Access denied." This error prevents users from accessing their system drive, thereby restricting the use of applications such as Microsoft Outlook and Office apps, as well as web browsers and system utilities.

Routine operations like opening files and launching applications can trigger the error. In severe cases, users face difficulties elevating privileges, uninstalling updates, or gathering diagnostic logs due to subsequent permission failures, complicating self-remediation efforts.

The issue predominantly affects Samsung Galaxy Book 4 and other Samsung consumer devices, with reports from regions including Brazil, Portugal, South Korea, and India. The impacted Windows versions are Windows 11 versions 25H2 and 24H2. No server platforms are affected.

Routine operations like opening files and launching applications can trigger the error.
Adam Foster · Thehackingpost

Microsoft's investigation suggests the Samsung Share application might be a contributing factor, although the root cause is still under examination. The problem may involve corrupted or improperly applied Access Control Lists (ACLs) on the system drive's root.

As of Mon, Mar 13, 2026, Microsoft has classified the issue as "Investigating" and has not released an official fix or workaround. An unofficial workaround circulating online involves reassigning C: drive ownership to the "Everyone" group, but Microsoft advises against this due to security risks.

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Microsoft recommends that affected users await an official patch and will provide updates as the investigation continues.

Based on reporting by Cyber Security News.

AI transparency. This article was produced with the assistance of artificial intelligence and published under human editorial oversight. AI systems can make mistakes. Read how we use AI (EU AI Act, Art. 50).
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