What to do when Windows won’t boot?


What Is the Unmountable Boot Volume Error?

“BOOT VOLUME” is the partition of your hard drive where Windows resides. The error happens when your computer can’t load Windows  normally, resulting in a blue screen of death. (BSOD)

“Stop Code” is the error message that identifies the Windows issue. In this example, it’s the unmountable boot volume stop code. There are many errors that may be displayed. Google to make sure it’s a boot issue. This one is fairly common.

windows blue screen of death

Due to corrupted or damaged files, this “Blue Screen of Death”(BSOD) appears. This screen can pop up at anytime, but usually after a Windows update or software driver installation. It could possibly be a bios issue if you’ve customized your BIOS aka CMOS.

The error does not always mean there is a hard drive failure.

Step 1: Reboot and See If It Happens Again

Windows is not perfect. You may see this message just once, and after rebooting Windows runs normal.

If you see the unmountable boot volume error blue screen while working, restart your PC and try to log in again. You should be fine and not to worry.


Some more in-depth troubleshooting. WARNING-If you are not comfortable call Brauntek or a reputable Computing Repair company.

Step 2: Create a Windows 10 Install Disk

When you cannot boot, you must get the necessary Windows tools on another Windows computer.

The Windows 10 Media Creation Tool  is what you need. Simply create Windows 10 installation media. You may create this tool using a USB thumb drive or a blank DVD. In order to boot from a USB drive or DVD, you must change the computer’s boot order. Usually F12,F11,ESC, etc.

 The Windows 10 Media Creation tool should be kept and labeled. Make sure yo keep it in a safe place you can find it if needed in the future.

Step 3: Use Windows Automatic Repair

Let Windows start from your USB or DVD until it loads up, then click the Next button. You’ll see the Install now screen. But you’re not interested in reinstalling Windows; click Repair your computer in the bottom-left instead.

windows repair your computer

On the following screen, select Troubleshoot to get a list of Advanced Options. Choose Startup Repair and choose the target OS: Windows 10 (or your current version).

From here, Windows will run an automatic repair that will hopefully take care of your issue. Once it’s done, exit the installer and try to boot your computer normally.

If Windows still shows an unmountable boot volume error after this, continue onto the next step.

Step 4: Repair the Master Boot Record

The Master Boot Record (MBR) contains information about where Windows lives on your hard drive and helps it load properly when you turn your computer on. If this becomes corrupted, it can lead to an unmountable boot volume message.

To repair the MBR, boot again from your Windows 10 install media and select Repair your computer > Troubleshoot. This time, on the Advanced Options screen, choose Command Prompt.

command prompt startup options

At the Command Prompt, type the following command to run an MBR repair:

bootrec /fixmbr

Wait until it completes, then run the following commands one at a time to attempt additional repairs:

bootrec /fixboot
bootrec /rebuildbcd

Enter exit to leave the Command Prompt once these finish running. Then reboot again and see if the error continues to pop up.

Step 5: Run the Ckhdsk Command

If an automatic repair and MBR repair didn’t solve your problem, you should next try Chkdsk. This important Command Prompt tool lets you check the hard drive for errors, which may cause the unmountable boot volume message.

Follow the above steps again to open a Command Prompt from the recovery menu, then enter the following command:

chkdsk /r c:

The /r flag locates any bad sectors on your disk and fixes those errors. If you don’t include this, Chkdsk will simply report errors it finds. You need to include c: so the operation scans your Windows partition (the most common location for it). Replace c: with d: or another letter if you’ve moved yours somewhere else.

Chkdsk may ask you to run next time the system restarts. If it does, enter Y for yes and reboot to start it.

chkdsk reboot message

This can take some time, so you may have to wait a bit. Once it’s done, reboot again and see if the issue has cleared up.

Step 6: Try an SFC Scan

For the final Command Prompt solution, you can try another important utility. SFC, or System File Checker, looks for corrupted Windows system files and attempts to fix them. If none of the above has fixed your issue yet, this is worth a try.

Open a Command Prompt on your recovery drive again, and enter the following command:

sfc /scannow

Wait until the process completes. It will tell you if it fixed anything. Like the other commands, after it completes you should reboot and try to load into Windows again.

Still Stuck?

If you’ve completed all the above and continue to see an unmountable boot volume error every time you boot, your problem is deeper. You have two options for further solutions.

First, you may have a hardware issue. Your hard or SSD drive could be corrupted, dying, or have a faulty connection. If you are comfortable with hardware, open your computer and check to make sure the hard drive cable is securely connected. Also, faulty RAM can also cause this problem or the RAM needs to be re-seated.

If all is ok,  run some diagnostic tests to determine if your storage device is dying. Replacing it should fix your issue. If you are not tech savvy, call us or a reputable Computing Repair company.

13 Windows Diagnostics Tools to Check Your PC’s Health 13 Windows Diagnostics Tools to Check Your PC’s Health Use these computer diagnostic tools to run a PC health check and fix issues. Some support Windows 10 diagnostics, specifically. Read More

After ruling out hardware, your Windows installation may be corrupted in a way that the above utilities can’t repair. In that case, your only option is to reinstall Windows. This is a pain and takes time, but isn’t as bad if you have a backup.

Solve the Unmountable Boot Volume Error for Good

If all fails using the Windows Media Creation Tools, re-installation of Windows is your best bet.


To Prevent these errors, we recommend the following FREE applications:

Tweaking.com-All in One Windows Repair


Advanced System Care FREE edition


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