If your computer or laptop does not boot into windows, chances are you will get this dreaded error message. This error occurs when your hard drives becomes corrupted and is unbootable. This could be caused by either improper shutdown or a malware infection.
If you do not get any error messages at first and the computer just keeps restarting, press the F8 key right before you see the windows logo screen. You will then see some options, choose “Disable automatic restart on system failure.”
Now your computer will restart and you will see the blue screen of death and the unmountable boot volume error message. Once you have confirmed this message, restart your computer and choose Launch start-up repair, if you do not get this option then press the F8 key again and choose repair your computer.
When the repair screen appears you should get select a keyboard input method, if you do not get this option and the circle just keeps spinning around, chances are your hard disk is severely corrupted.
In this case restart the computer and press F2 to go into the BIOS and change you hard drive interface setting from AHCI to ATA, save the configuration and restart the computer.
Go back into repair mode and you should get the select a keyboard input method, then you will have to choose the username. Choose the username, enter the password and you will come to the repair screen.
Choose command prompt and type “chkdsk c: /r” where c: is the letter of your hard disk. Then choose “Y” to unmount the volume, if it appears, chkdsk will then start checking the disk for errors and repair them.
Once it is done checking the disk for errors, restart the computer and go back into the BIOS and change the hard drive interface setting back to AHCI, only if you changed it before.
If the computer stills does not boot into windows go back to the repair your computer screen, choose command prompt. Then type “Bootrec /Fixboot” and restart the computer. If you still have no luck, go back into repair mode, command prompt and type “Bootrec /Fixmbr” and then reboot your computer.