Detailed steps on how to fix an unmountable boot volume in Windows 10 or 11

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Restart your computer. Sometimes, an unmountable boot volume error can be caused by a temporary glitch. Restarting your computer may fix the problem.

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Boot into your computer's BIOS or UEFI settings. To do this, you will need to press a specific key or combination of keys when your computer is starting up. The specific key or combination of keys will vary depending on your computer's manufacturer and model.

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Once you're in the BIOS or UEFI settings, you can try changing the boot order so that your computer tries to boot from a different drive.from your USB drive.

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 If you can boot from a different drive, you can try to repair the boot volume on your main drive. To do this, you can use the Startup Repair tool or the System File Checker (SFC) tool.

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To use the Startup Repair tool, insert your Windows installation media and boot from it. Once you're booted into the Windows installation media, click on the "Repair your computer" option.

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 On the "Choose an option" screen, click on the "Troubleshoot" option.

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On the "Troubleshoot" screen, click on the "Advanced options" option.

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On the "Advanced options" screen, click on the "Startup Repair" option.

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The Startup Repair tool will then scan your computer for problems and try to fix them. If the Startup Repair tool can fix the problem, you will be able to boot into Windows normally.

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If the Startup Repair tool can't fix the problem, you can try to use the System File Checker (SFC) tool. To do this, open a command prompt window.

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In the command prompt window, type the following command and press Enter:

sfc /scannow 

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The SFC tool will then scan your computer for corrupted system files and try to fix them. If the SFC tool can fix the problem, you will be able to boot into Windows normally.

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If the Startup Repair tool and the SFC tool can't fix the problem, you may need to reinstall Windows. To do this, insert your Windows installation media and boot from it.

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 Once you're booted into the Windows installation media, click on the "Install now" option.

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Follow the on-screen instructions to reinstall Windows.