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[Windows 7 FAQ 一覧] - [Windows failed to start. A recent hardware or software change might be the cause のエラーで VirtualBox上の Windows が起動しない]
以下のエラー (0xc0000225) で VirtualBox上の Windows の起動に失敗する場合があります。
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Windows failed to start. A recent hardware or software change might be the cause. To fix the problem:
1. Insert your windows installation disc and restart your computer.
2. Choose your language settings, and then click "Next."
3. Click "Repair your computer."
If you do not have this disc, contact your system administrator or computer
manufacturer for assistance.
Status: 0xc0000225
Info: An unexpected error has occured.
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この場合、OracleBoxの設定で"IO APICを有効化" をチェックしてください。正常に起動できる場合があります。