After Interrupted Windows 10 install (while in legacy support). Windows wont boot / complete installation or detect bootable USB drive anymore (Lenovo Yoga 2 Pro)

Alassane Sarr 1 Reputation point

Context/how one issue led to another:

Initial issue: I was experiencing a BootLoop with a Lenovo Yoga 2 Pro laptop.

So I took below steps:

How current issue started:

  • When it rebooted to complete the install, I might have plugged out my USB drive at an akward time (when laptop had already restarted - somewhere between the Lenovo logo and the Windows logo).
  • Then at Windows logo., tt took a very very long time (no activity). So I powered it off then restarted. Windows logo showed up. Started loading and at around 5% or 6% i believe. I got a blue screen error stating "Your computer encountered a problem and needs to restart". Then it automatically restarted. And upon restart, immediatly after the Lenovo logo, got "Your pc couldn't start properly error code 0xc000001".
  • So it rebooted and ever since, it keeps getting back to the same errors in the same order. First attempt. Error 1. Then upon auto restart Error 2..

What I tried so far:

  • On that screen I tried the options from F1 to F9. I tried "Safe Mode" to no avail. Says "Windows cannot complete installation in safe mode. To continue installing windows restart computer"".
  • I tried Shift + F10 to open Command Prompt. Tried editing registry as explained here (Method 1): to no avail


Automatic Repair is not available anymore (probably because I deleted partitions during install).

And my laptop wont detect USB drive at boot (not in BIOS nor Boot Menu): probably because I plugged it out at an akward time during install and/or it is still in the middle of an interrupted install.

Additional info:

  • Windows 10 Fresh install was made when in legacy mode.
  • Now EFI is empty in BIOS.
  • Boot Menu only shows HD.
  • USB Drive initially used during failed install is nowhere to be seen anymore (not in Boot Menu nor Legacy Options in BIOS)

Are there any suggestions that could allow to either:

  • complete the interrupted installation
  • or access the USB drive again to repair or restart installation process

Thanks in advance

Windows 10
Windows 10
A Microsoft operating system that runs on personal computers and tablets.
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  1. Jenny Feng 13,976 Reputation points

    It is more difficult to complete an interrupted installation at this stage.
    During the entire install scenario, early on in the process Windows will copy all the files it needs from the USB drive to your hard drive. Typically after the first reboot, you can remove it. If the installation process needs it again, it will ask for it.

    I think its still trying to boot from USB since you changed boot order. So it keeps booting into setup.
    Add the hard drive back to the boot order in BIOS, then it will boot.
    Then you can try to see if it can be repaired or reinstalled.

    Hope above information can help you.

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