Install Windows after "Operating system not found".

Question

Hello,

1 or 2 weeks ago I received a notification asking me if I wanted to install updates in my Windows 10. Because I only had 3Gb of free space in my 500Gb computer I choosed to install in the next day. ... After 4 consecutive days choosing to wait 1 more day to install, And error come to my computer. I wasn't able to start windows 10.

After that I was able to recover 150Gb of videos and images from my computer directly to an external hard drive thanks to vaio file recover.

After trying to restart my Windows to a default Windows I am only able to watch 1 line of text in my computer: "Operating system not found".

How can I reinstall any Windows using my Windows key that comes near my computer battery under my keyboard?

Thank you and keep doing your awesome work :)

Answer 1

Hi Michi, you can reinstall Windows 10 at any time and it will not cost you anything !

Since you previously had Windows 10 installed and activated on that PC during the installation process skip the steps which ask for a product key and select the option 'I am Reinstalling Windows 10 on this PC', and activation will not be an issue, your PC will have a digital entitlement stored on the Microsoft Activation Servers

Make sure you install the same Edition of Windows 10 (Home, Pro . . . etc.) you previously had installed to avoid Activation issues

Click this link:

https://www.microsoft.com/en-gb/software-downlo...

to download the Media Creation Tool (Click on Download Tool Now), with that you can download the latest Windows 10 ISO (Select Create Installation Media for Another PC), you can create a bootable USB flash drive (min 8GB) using that tool

Then, Boot your PC from the Installation Media you just created (change Boot Order in your BIOS) to begin installing Windows 10

If you have problems booting from a boot disc, you may have UEFI BIOS:

Insert the Bootable Installation Media, then go into your BIOS and make the following changes:

1. Disable Secure Boot
2. Enable Legacy Boot
3. If Available enable CSM
4. If Required enable USB Boot
5. Move the device with the bootable disc to the top of the boot order
6. Save BIOS changes, restart your System and it should boot from the Installation Media

Answer 2

Hello,

On a working computer, create an Installation media of Windows 10 that allows you to repair existing Windows Installation.

Create a USB Flash Drive

https://www.tenforums.com/tutorials/2376-create...

Boot from the USB Flash drive-Make sure you have disabled Secure boot/Fast boot:

https://www.tenforums.com/tutorials/21756-boot-...

https://www.tenforums.com/tutorials/21284-enabl...

Then open Advanced Startup options after the computer boots from USB:

Click Repair your computer at the first screen that says Install now.

https://www.tenforums.com/tutorials/2294-boot-a...

Select Startup repair, let it finish the job and see if the computer can boot afterward.

Answer 3

Power on and off your computer three times

On the third time, your computer will boot into the Advanced Recovery environment

Click Advanced Options

Click Troubleshoot

Click Advanced Options

Click System Restore, see if you can go back to an earlier time.

If not, boot into the recovery environment again, then try performing a startup repair.

If that does not work, boot into the recovery environment, then click 'Go back to previous version of Windows'

If that does not work.

Go to a working computer, download, create a bootable copy, then perform a clean install.

	Step 1: How to download official Windows 10 ISO files 

	[http://answers.microsoft.com/en-us/windows/wiki...](http://answers.microsoft.com/en-us/windows/wiki/windows_10-windows_install/how-to-download-official-windows-10-iso-files/35cde7ec-5b6f-481c-a02d-dadf465df326)



	Step 2: How to: Perform a clean install of Windows 10

	[http://answers.microsoft.com/en-us/insider/wiki...](http://answers.microsoft.com/en-us/insider/wiki/insider_wintp-insider_install/how-to-do-a-clean-install-of-windows-10/aef0ae63-2117-41ee-a8ea-4a3181625b08)



If there are files on the drive you want to recover, see -  How to: Perform a Custom install of Windows 10

[http://answers.microsoft.com/en-us/insider/wiki...](http://answers.microsoft.com/en-us/insider/wiki/insider_wintp-insider_install/how-to-do-a-custom-installation-of-windows/38adfa8c-32f8-4354-8c53-13b5f2cf7e44)

Answer 4

Ciao,

you need to create a medium with Windows 10 on it (on another PC, of course):

https://www.microsoft.com/en-us/software-downlo...

Please let me know if this helps.

Ciao

Ugo

Answer 5

Power on and off your computer three times

On the third time, your computer will boot into the Advanced Recovery environment

Click Advanced Options

Click Troubleshoot

Click Advanced Options

Click System Restore, see if you can go back to an earlier time.

If not, boot into the recovery environment again, then try performing a startup repair.

If that does not work, boot into the recovery environment, then click 'Go back to previous version of Windows'

If that does not work -

Go to a working computer, download, create a bootable copy, then perform a clean install.

1. Download Windows 10 ISO files using Media Creation Tool

https://answers.microsoft.com/en-us/windows/for...

2. Perform a clean or custom install

A. Clean Install

https://answers.microsoft.com/en-us/windows/for...

B. Custom Install - If you have files which you don't want to lose

https://answers.microsoft.com/en-us/windows/for...