Windows 10 Unmountable Boot Volume Error

Windows 10

Asked by: ZachFuj

I have a Lenovo G50-45. About six weeks ago I installed Windows 10 after months of ignoring the notification informing me I should update. Yesterday my computer installed an update to 10. Later, after the updates were complete and I had been using my computer for a few hours, it started functioning very slowly which lead me to restart the computer from the Windows menu.

The computer was having trouble restarting so after about 30 minutes of inactivity I opted to hard reset it with the power button. Upon turning it on I was shown the UNMOUNTABLE_BOOT_VOLUME error screen. I have perused your already given answers for a way to fix this issue but the same response has been given to all of them which requires the windows 10 installation DVD and the Windows Media Creation Tool. Because I downloaded the Windows 10 operating system I do not have the installation disk and thus need an alterior method for fixing my now useless 10 month old laptop with hundreds of pages of writing on it.

Answered by: Abdul_Malik

Hi Zach,

Thank you for posting your query in Microsoft Community.

Apologize for the difficulties that you're experiencing in Windows 10.

Not to worry, we’re here to help you out.

A blue screen error (also called a stop error) can occur if a problem causes your PC to shut down or restart unexpectedly.

Let us try to perform Startup repair from Advance boot option and check if it helps.

It may ask you to insert the Installation DVD/USB while doing startup repair.

You have to create an installation media for that.

You may refer to the following link to download Windows 10 ISO file and create an installation media.


Once your media is ready follow the steps.

  • After you boot your computer using Windows 10 CD/ DVD or System Repair Disc, a black screen appears with gray text "Press any key to boot from CD or DVD". Press any key.

  • Select the correct time and Keyboard type.

  • Click on Repair your computer in the lower left corner.

  • Select Troubleshoot from Choose an option screen.

  • Click on Advanced options in Troubleshoot screen.

  • Click on Automatic Repair from Advanced Options screen.

  • Next, choose the operating system by clicking on its button.

  • Windows 10 will look for problems on hard drive(s) and verify that all required files are intact. 

Hope it helps.

Let us know the status, we are glad to assist you further.

Thanks & regards,

Abdul Malik
Files, folders, & storage Yesterday, 21:02 0 Comment 58 views

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