A critical Windows 11 bug has locked some users out of the C: drive, Microsoft admits — here’s what you can do if you’re affected is currently attracting attention in the technology world.
Experts believe this development may influence how digital platforms evolve
over the coming years.
There has been more woe for selected Windows 11 users over the last few days, with a nasty software bug locking a substantial number of people out of their main C: drive. Microsoft has acknowledged the problem, and is working on a fix.
As reported by Neowin and others, the bug triggers the message “C:\ is not accessible – Access denied”. It appears to have been introduced in the February 2026 security update (KB5077181), and is predominantly affecting laptops manufactured by Samsung.
In its official support note, Microsoft suggests the problem might be related to the Samsung Share app, but that’s not confirmed at this stage. What is clear is that it’s crippling hard drive access and many applications for affected users.
Office apps and web browsers are among the programs that this major bug causes problems for, Microsoft reports. It says it’s “presently investigating” the bug, together with Samsung, and will issue updates “when more information is available”.
Neowin notes that only the latest Windows 11 versions 24H2 and 25H2 appear to be impacted by the bug, while as reported by Microsoft multiple regions are affected, including Brazil, Portugal, Korea, and India.
If you’ve been hit by this bug, you’ll know about it: Microsoft says “accessing files, launching applications, or performing administrative tasks” can trigger the error message, and for many users it’s making their platforms pretty much unusable.
There is the standard safety net of an update rollback, which you can find via the Settings > Windows Update menu — Microsoft has full instructions here. Alternatively if you haven’t installed the February 2026 update yet, hit pause for now.
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The enterprising folk posting on Reddit have some suggestions about workarounds that involve changing ownership of the C: drive, and while this seems to have worked for some users, it’s not without risks — so proceed with caution if you do try those fixes.
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Dave is a freelance tech journalist who has been writing about gadgets, apps and the web for more than two decades. Based out of Stockport, England, on TechRadar you’ll find him covering news, features and reviews, particularly for phones, tablets and wearables. Working to ensure our breaking news coverage is the best in the business over weekends, David also has bylines at Gizmodo, T3, PopSci and a few other places besides, as well as being many years editing the likes of PC Explorer and The Hardware Handbook.
Why This Matters
This development highlights the rapid pace of innovation in the technology sector.
Companies are constantly pushing boundaries in order to stay competitive.
Analysts suggest that such changes could influence future product design,
user expectations, and industry standards.
Looking Ahead
As technology continues to evolve, developments like this may shape the next
generation of digital services and consumer experiences.
Industry watchers will continue to monitor how this story develops and what
impact it may have on the broader technology landscape.