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How to fix when Windows Boot Manager disappears!

Even if you get a "Windows Boot Manager not found" error when starting up your PC, you can rest assured!

You can easily solve it using the Partition Assistant.

If you have trouble with system startup trouble, please try it.

The Windows Error # Boot Manager # PC repair # can not start Computer Error

2025/8/22 Edited to

Windows Boot Manager（ブートマネージャー）が消えてしまうと、パソコンは正常にOSを起動できなくなり、非常に焦る状況になります。私も一度、突然パソコンの起動時に「Windows Boot Managerが見つからない」というエラーが表示されて起動不能になった経験があります。最初はどうすれば良いのか全く分からず途方に暮れましたが、Partition Assistantというツールを使うことで無事に解決できました。このツールはパーティション管理が主な目的ですが、特定のブート関連の問題修復もサポートしています。まずは別の正常に動くPCでPartition Assistantを公式サイトからダウンロードし、ブートエラーが起きているPCにインストールします。その上で、起動できないシステムドライブのブートファイルの修復を試みることで、Windows Boot Managerを復元できます。また、エラー画面のメッセージ「BOOTMGR is Missing Press Ctrl+Alt+Del to restart」が出た場合は、BIOS設定でブート順序を確認することも重要です。USBメモリや外部ドライブに優先的に起動が設定されていると正常な起動が妨げられることがあるため、内蔵ハードディスクを先頭に設定しましょう。もしブートマネージャーの問題でなく、ハードディスクの故障やファイルの破損が原因であれば、データバックアップを優先し、修復ツールやWindows回復環境（WinRE）を使って修復作業を進めることをおすすめします。このようなトラブルは専門知識がなくても、市販のパーティション管理ツールやWindows標準の修復機能を活用すれば対処可能なので、焦らず冷静に手順を進めることが重要です。皆さんも万が一Windows Boot Managerが消えたと感じたときは、今回紹介した方法をぜひ参考にしてみてください。

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