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Samsung Windows 11 C: drive access-denied disruption after February 2026 updates

Service Disruption
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1 unique sources, 1 articles

Summary

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Microsoft is investigating a Windows 11 service disruption affecting some Samsung laptops after the February 2026 security updates, with users seeing C:\ is not accessible – Access denied and losing access to apps. The problem can block Outlook, Office apps, web browsers, system utilities, and Quick Assist, and may also interfere with administrative tasks such as privilege elevation and update removal. Reports are concentrated in Brazil, Portugal, South Korea, and India, mainly on Samsung Galaxy Book 4 and other Samsung consumer devices. Microsoft says the issue may involve Samsung Share, but the root cause is still under investigation and no official workaround has been shared.

Related Happenings

Microsoft Windows 11 KB5089549 cumulative update

Security Patch Release
First: 18.05.2026 11:33 Last: 18.05.2026 11:33 Sources 1

About this happening: Microsoft's **KB5089549** **Windows 11** security update is failing to install on some systems, forcing affected devices to roll back during reboot. The problem is tied to a nearl...

Open Happening

Microsoft Windows Autopatch fix for EU restricted driver update deployment bug

Security Tool/Service
First: 13.05.2026 17:36 Last: 13.05.2026 17:36 Sources 1

About this happening: **Microsoft** fixed a **Windows Autopatch** service bug that let **restricted driver updates** reach some managed devices in the **EU**, bypassing admin approval controls and crea...

Open Happening

Microsoft Windows 365 Office installation disruption

Service Disruption
First: 13.05.2026 14:53 Last: 13.05.2026 14:53 Sources 1

About this happening: The **Windows 365** service update has introduced a **configuration change** that is blocking **Office downloads and installs** for some customers, disrupting access on cloud PCs....

Open Happening

Microsoft Edge regression disrupts Teams meeting joins

Service Disruption
First: 23.04.2026 16:18 Last: 23.04.2026 16:18 Sources 1

About this happening: A **Microsoft Edge** regression is preventing some **Windows** users from joining **Microsoft Teams** meetings, causing a limited-scope access disruption for scheduled and link-ba...

Open Happening

Microsoft Classic Outlook email sending disruption

Service Disruption
First: 02.04.2026 12:12 Last: 02.04.2026 12:12 Sources 1

About this happening: **Microsoft** is investigating a **Classic Outlook** disruption that can prevent some users from sending or replying to email through **Outlook.com**, causing **NDR errors** and m...

Latest development: 06.04.2026 22:19

Microsoft fixed a known issue affecting some Classic Outlook users sending emails via Outlook.com that could return non-delivery reports (NDRs) with 0x80070005-0x0004dc-0x000524 errors. Microsoft said the service change was in production as of April 3, 2026, and advised affected users to use the New Outlook client or Outlook.com on the web; Microsoft also pointed users to downloading the Outlook Address Book for affected Outlook.com accounts.

Open Happening

Timeline

  1. 14.03.2026 00:11 2 articles · 2mo ago

    Microsoft investigates Samsung Windows 11 C: drive access-denied issue

    Initial Disclosure

    Microsoft said some Samsung laptops running Windows 11 can lose access to the C:\ drive and fail to launch applications after the February 2026 security updates, producing "C:\ is not accessible – Access denied" and affecting Outlook, Office apps, web browsers, system utilities, and Quick Assist; the company is working with Samsung, suspects Samsung Share may be involved, and has not yet confirmed the root cause.

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