\nMicrosoft has received reports of an issue in which some Samsung device models lose access to the C: drive after installing the February 2026 security update (KB5077181) and subsequent updates. Users might encounter the error, \u201cC:\\ is not accessible \u2013 Access denied\u201d, which prevents access to files and blocks the launch of some applications including Outlook, Office apps, web browsers, system utilities and Quick Assist.<\/p>\n
Microsoft\u306f\u30012026\u5e742\u6708\u306e\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u66f4\u65b0\u30d7\u30ed\u30b0\u30e9\u30e0(KB5077181)\u304a\u3088\u3073\u305d\u306e\u5f8c\u306e\u66f4\u65b0\u3092\u30a4\u30f3\u30b9\u30c8\u30fc\u30eb\u3057\u305f\u4e00\u90e8\u306eSamsung\u30c7\u30d0\u30a4\u30b9\u3067\u3001C\u30c9\u30e9\u30a4\u30d6\u306b\u30a2\u30af\u30bb\u30b9\u3067\u304d\u306a\u304f\u306a\u308b\u554f\u984c\u304c\u767a\u751f\u3057\u3066\u3044\u308b\u3068\u306e\u5831\u544a\u3092\u53d7\u3051\u3066\u3044\u307e\u3059\u3002\u30e6\u30fc\u30b6\u30fc\u306f\u300cC:\\\u306f\u30a2\u30af\u30bb\u30b9\u3067\u304d\u307e\u305b\u3093\u2013\u30a2\u30af\u30bb\u30b9\u304c\u62d2\u5426\u3055\u308c\u307e\u3057\u305f\u300d\u3068\u3044\u3046\u30a8\u30e9\u30fc\u306b\u906d\u9047\u3059\u308b\u53ef\u80fd\u6027\u304c\u3042\u308a\u3001\u3053\u308c\u306b\u3088\u308a\u30d5\u30a1\u30a4\u30eb\u3078\u306e\u30a2\u30af\u30bb\u30b9\u304c\u59a8\u3052\u3089\u308c\u3001Outlook\u3001Office\u30a2\u30d7\u30ea\u3001Web\u30d6\u30e9\u30a6\u30b6\u3001\u30b7\u30b9\u30c6\u30e0\u30e6\u30fc\u30c6\u30a3\u30ea\u30c6\u30a3\u3001Quick Assist\u306a\u3069\u4e00\u90e8\u306e\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u304c\u8d77\u52d5\u3067\u304d\u306a\u304f\u306a\u308a\u307e\u3059\u3002<\/p>\n
Affected devices encounter the issue when users execute common actions, such as accessing files, launching applications, or performing administrative tasks, and do not require any specific user action beyond routine operations. In some cases, users are also unable to elevate privileges, uninstall updates, or collect logs due to permission failures.<\/p>\n
\u5f71\u97ff\u3092\u53d7\u3051\u305f\u30c7\u30d0\u30a4\u30b9\u3067\u306f\u3001\u30d5\u30a1\u30a4\u30eb\u3078\u306e\u30a2\u30af\u30bb\u30b9\u3001\u30a2\u30d7\u30ea\u306e\u8d77\u52d5\u3001\u7ba1\u7406\u30bf\u30b9\u30af\u306e\u5b9f\u884c\u3068\u3044\u3063\u305f\u4e00\u822c\u7684\u306a\u64cd\u4f5c\u3092\u884c\u3046\u3060\u3051\u3067\u554f\u984c\u304c\u767a\u751f\u3057\u3001\u7279\u5225\u306a\u64cd\u4f5c\u306f\u5fc5\u8981\u3042\u308a\u307e\u305b\u3093\u3002\u5834\u5408\u306b\u3088\u3063\u3066\u306f\u3001\u6a29\u9650\u6607\u683c\u304c\u3067\u304d\u306a\u3044\u3001\u66f4\u65b0\u30d7\u30ed\u30b0\u30e9\u30e0\u3092\u30a2\u30f3\u30a4\u30f3\u30b9\u30c8\u30fc\u30eb\u3067\u304d\u306a\u3044\u3001\u30ed\u30b0\u3092\u53ce\u96c6\u3067\u304d\u306a\u3044\u306a\u3069\u3001\u6a29\u9650\u30a8\u30e9\u30fc\u306b\u3088\u3063\u3066\u8ffd\u52a0\u306e\u4f5c\u696d\u3082\u59a8\u3052\u3089\u308c\u308b\u3053\u3068\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n
This issue has been reported across multiple regions, including Brazil, Portugal, Korea, and India, and is predominantly observed on Samsung Galaxy Book 4 and other Samsung consumer devices. Latest investigations indicate that the issue may be related to the Samsung Share application, though the root cause has not yet been fully validated.<\/p>\n
\u3053\u306e\u554f\u984c\u306f\u30d6\u30e9\u30b8\u30eb\u3001\u30dd\u30eb\u30c8\u30ac\u30eb\u3001\u97d3\u56fd\u3001\u30a4\u30f3\u30c9\u306a\u3069\u8907\u6570\u306e\u5730\u57df\u3067\u5831\u544a\u3055\u308c\u3066\u304a\u308a\u3001\u7279\u306bSamsung Galaxy Book 4\u3092\u306f\u3058\u3081\u3068\u3059\u308bSamsung\u306e\u30b3\u30f3\u30b7\u30e5\u30fc\u30de\u30fc\u5411\u3051\u30c7\u30d0\u30a4\u30b9\u3067\u591a\u304f\u78ba\u8a8d\u3055\u308c\u3066\u3044\u307e\u3059\u3002\u6700\u65b0\u306e\u8abf\u67fb\u3067\u306f\u3001Samsung Share\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u304c\u95a2\u9023\u3057\u3066\u3044\u308b\u53ef\u80fd\u6027\u304c\u793a\u3055\u308c\u3066\u3044\u307e\u3059\u304c\u3001\u6839\u672c\u539f\u56e0\u306f\u307e\u3060\u5b8c\u5168\u306b\u306f\u7279\u5b9a\u3055\u308c\u3066\u3044\u307e\u305b\u3093\u3002\n<\/p><\/blockquote>\n
Microsoft\u306b\u3088\u308b\u3068\u3001\u3053\u306e\u4e0d\u5177\u5408\u306fSamsung Galaxy Book4<\/strong>\u3092\u4e2d\u5fc3\u3068\u3057\u305fSamsung\u88fd\u30c7\u30d0\u30a4\u30b9<\/strong>\u3067\u591a\u304f\u767a\u751f\u3057\u3066\u304a\u308a\u3001\u5831\u544a\u306f\u30d6\u30e9\u30b8\u30eb\u3001\u30dd\u30eb\u30c8\u30ac\u30eb\u3001\u97d3\u56fd\u3001\u30a4\u30f3\u30c9\u306a\u3069\u7279\u5b9a\u5730\u57df\u306b\u96c6\u4e2d\u3057\u3066\u3044\u308b\u305d\u3046\u3067\u3059\u3002\u539f\u56e0\u3068\u3057\u3066Samsung Share<\/strong>\u30a2\u30d7\u30ea\u304c\u95a2\u4fc2\u3057\u3066\u3044\u308b\u53ef\u80fd\u6027\u304c\u6307\u6458\u3055\u308c\u3066\u3044\u307e\u3059\u304c\u3001\u307e\u3060\u78ba\u5b9a\u306b\u306f\u81f3\u3063\u3066\u3044\u307e\u305b\u3093\u3002<\/p>\n\u5f71\u97ff\u3092\u53d7\u3051\u308bWindows\u30d0\u30fc\u30b8\u30e7\u30f3\u306f\u3001Windows 11 24H2\/25H2<\/strong>\u306b\u9650\u5b9a\u3055\u308c\u3066\u304a\u308a\u3001Windows 10\u3084Windows 11 23H2\u4ee5\u524d\u306e\u30d0\u30fc\u30b8\u30e7\u30f3\u306f\u5f71\u97ff\u3092\u53d7\u3051\u3066\u3044\u306a\u3044\u3088\u3046\u3067\u3059\u3002<\/p>\nReddit<\/a>\u3067\u306f\u300cC\u30c9\u30e9\u30a4\u30d6\u306e\u6240\u6709\u6a29\u3092\u5909\u66f4\u3059\u308b\u3068\u76f4\u308b\u300d\u3068\u3044\u3046\u5831\u544a\u3082\u3042\u308a\u307e\u3059\u304c\u3001\u30b7\u30b9\u30c6\u30e0\u7834\u640d\u306e\u30ea\u30b9\u30af\u304c\u9ad8\u304f\u63a8\u5968\u3055\u308c\u307e\u305b\u3093\u3002\u30a2\u30c3\u30d7\u30c7\u30fc\u30c8\u306e\u30ed\u30fc\u30eb\u30d0\u30c3\u30af\u3082\u6210\u529f\u3057\u306a\u3044\u30b1\u30fc\u30b9\u304c\u3042\u308b\u305f\u3081\u3001\u73fe\u6642\u70b9\u3067\u4e00\u822c\u30e6\u30fc\u30b6\u30fc\u304c\u5b89\u5168\u306b\u3067\u304d\u308b\u5bfe\u51e6\u306f\u5c11\u306a\u304f\u3001Microsoft\u306e\u4fee\u6b63\u3092\u5f85\u3064\u306e\u304c\u6700\u3082\u5b89\u5168\u3068\u3055\u308c\u3066\u3044\u307e\u3059\u3002<\/p>\n\u307e\u3068\u3081<\/h2>\n
\u4eca\u56de\u306e\u4e0d\u5177\u5408\u306f\u3001\u7279\u5b9a\u30e1\u30fc\u30ab\u30fc\u30fb\u7279\u5b9a\u5730\u57df\u306b\u9650\u5b9a\u3055\u308c\u3066\u3044\u308b\u3068\u306f\u3044\u3048\u3001PC\u306e\u6839\u5e79\u3067\u3042\u308bC\u30c9\u30e9\u30a4\u30d6\u304c\u7a81\u7136\u30a2\u30af\u30bb\u30b9\u4e0d\u80fd\u306b\u306a\u308b\u975e\u5e38\u306b\u6df1\u523b\u306a\u554f\u984c\u3067\u3059\u3002Microsoft\u306f\u8abf\u67fb\u3092\u9032\u3081\u3066\u304a\u308a\u3001\u4eca\u5f8c\u306e\u8ffd\u52a0\u60c5\u5831\u3084\u4fee\u6b63\u30d1\u30c3\u30c1\u304c\u5f85\u305f\u308c\u307e\u3059\u3002Samsung\u88fd\u30ce\u30fc\u30c8\u3092Windows 11 24H2\/25H2\u3067\u5229\u7528\u3057\u3066\u3044\u308b\u30e6\u30fc\u30b6\u30fc\u306f\u3001\u3057\u3070\u3089\u304f\u30a2\u30c3\u30d7\u30c7\u30fc\u30c8\u9069\u7528\u306b\u614e\u91cd\u306b\u306a\u308b\u5fc5\u8981\u304c\u3042\u308a\u305d\u3046\u3067\u3059\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
\uff0a2026\/3\/16\u65e5\u66f4\u65b0: \u305d\u306e\u5f8c\u306e\u8abf\u67fb\u306b\u3088\u308aSamsung\u88fd\u30a2\u30d7\u30ea\u300cGalaxy Connect\u300d\u304c\u539f\u56e0\u3060\u3063\u305f\u3053\u3068\u304c\u5224\u660e\u3057\u3066\u3044\u307e\u3059\u3002 Microsoft\u306f\u30012026\u5e742\u6708\u6708\u4f8b\u66f4\u65b0\u30d7\u30ed\u30b0\u30e9\u30e0(KB5077181)\u3092\u9069\u7528 […]<\/p>\n","protected":false},"author":2,"featured_media":128611,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"swell_btn_cv_data":"","footnotes":""},"categories":[3],"tags":[3298,4387],"class_list":["post-133452","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-windows","tag-windows","tag-windows11"],"_links":{"self":[{"href":"https:\/\/softantenna.com\/blog\/wp-json\/wp\/v2\/posts\/133452","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/softantenna.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/softantenna.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/softantenna.com\/blog\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/softantenna.com\/blog\/wp-json\/wp\/v2\/comments?post=133452"}],"version-history":[{"count":0,"href":"https:\/\/softantenna.com\/blog\/wp-json\/wp\/v2\/posts\/133452\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/softantenna.com\/blog\/wp-json\/wp\/v2\/media\/128611"}],"wp:attachment":[{"href":"https:\/\/softantenna.com\/blog\/wp-json\/wp\/v2\/media?parent=133452"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/softantenna.com\/blog\/wp-json\/wp\/v2\/categories?post=133452"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/softantenna.com\/blog\/wp-json\/wp\/v2\/tags?post=133452"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}
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<\/p>\n