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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

私が「Windows Boot Managerが消えた!?」状態になったとき、まずやったのは“原因の切り分け”でした。いきなり修復ツールを回すより、ここを押さえると復旧が早いです。 1) まず確認：BIOS/UEFIの起動順序意外と多いのが、USBメモリや外付けSSDを挿したまま再起動して、起動デバイスがズレるパターンです。UEFI設定画面で「Windows Boot Manager」が起動優先にあるか確認し、無ければ一度“起動順序をデフォルトに戻す”のも有効でした。ケーブルが緩い（特にデスクトップのSATA）こともあるので、可能なら差し直しもチェック。 2) エラー文で当たりを付ける・「BOOTMGR is missing」→ MBR/BCDまわりの破損や起動情報の参照ミスが多め・「Windows Boot Managerが見つからない」→ UEFIエントリ消失、BCD破損、設定変更などこの時点で「MBR破壊」「破損したBCD（ブート構成データ）」の可能性を疑いました。 3) BitLockerが有効なら“中断/回復キー”に注意会社PCや一部の個人PCはBitLockerがONのことがあります。修復や起動順変更で回復キーを求められる場合があるので、分からない場合は先に確認しておくと安全です（私はここで一度手が止まりました）。 4) Partition Assistantで直した流れ（私のやり方）別PCが使える前提ですが、これが一番ラクでした。 (1) 別PCにPartition Assistantをインストール (2) ブータブルUSBを作成 (3) 問題のPCをUSBから起動 (4) ツールバー →「ツール」→「UEFIブートマネージャー」を開く (5) 表示される「Windows Boot Manager」を修復/再作成する画像の通り、この手順で“Windows Boot Managerを修復可能”でした。 5) それでも直らない時の追加チェック・「回復不可能セクタ数」が増えている/異音がする：ストレージ故障の可能性。修復より先にバックアップ優先・リムーバブルディスクが読み込まない：USBポート変更、別USBで作り直し、UEFI/Legacy設定の見直し・Windows回復環境（その他の回復オプション）に入れるなら、スタートアップ修復も試す起動トラブルは焦りますが、起動順の確認→BCD/UEFIエントリ修復→ストレージ異常の確認、の順で進めると失敗しにくかったです。

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