Windows 11 February Patch (KB5077181) Can Make Drive C Inaccessible on Some Samsung PCs
Microsoft has updated its Windows 11 documentation to describe a recently discovered issue tied to the February 2026 Patch Tuesday update (KB5077181). On certain machines—predominantly Samsung consumer laptops—installing that update can result in an error that prevents access to the system drive, showing “C: is not accessible – Access denied.” The problem can go beyond a simple File Explorer error and, in some cases, block common applications and administrative actions.…