Système d'exploitation manquant Solved

Question

Big problem... I put my PC (tower) into safe mode yesterday, and upon restarting, Windows asked me for the Microsoft code which I entered several times, but I received the message that the code was incorrect... impossible to restart!
I took my last system image backup, booted into the BIOS from my USB drive where I have Windows, went to advanced options, system image recovery, and selected my last system backup which I have on an external hard drive, but at the end of the operation, I got a message "error code 0800..." indicating that the backup had failed!
Now, when I restart my PC, I get the message Missing Operating System, so I restart into the BIOS, boot from my Windows USB drive, go to reset my PC, choose the option to keep my files, and I get the message "the drive where Windows is installed is locked, unlock the drive and then try again..."
I checked the drive, but I am not competent to unlock it!
Does anyone know how to do it?
A big thank you in advance for your help.

Malekal_morte- · Answer

Hello,

This may be related to a hard drive issue.

Reinstall Windows 10 without formatting:

The principle is to create a Windows 10 installation USB drive and boot the computer from it to reinstall Windows without formatting.
Since the computer is frozen, you need to create this from another working computer.

To create the USB drive:

Create a USB drive with Media Creation Tool: https://www.malekal.com/windows-10-media-creation-tool/
Boot from it by changing the boot sequence and indicating the USB drive or DVD: How to boot the computer from USB drive

If the USB drive does not work, try creating one again with Rufus: how to download Rufus.
Download the ISO file, for example with Adguard: Download Windows ISO
Launch Rufus and specify the ISO file
In partition type, choose GPT.
For more details, refer to this tutorial for details: how to create a bootable USB installation drive for Windows

The Windows 10 setup program should then start:

Follow this tutorial that explains how to install Windows 10: how to install Windows 10.
All steps are provided from A to Z with advice at the end to secure Windows 10.

Let yourself be guided to install Windows 10.
Choose customize (not upgrade)
During the partition phase, select the main partition and click next.

The installer will tell you that Windows is already present and offer to move it.

Follow the Windows installation procedure using the tutorial above.

Do not format, especially.

Your user data will be copied to the Windows.old folder.

Once Windows is installed, I recommend following these tips to properly configure and use Windows: Tips after reinstalling Windows.

--
Please press a key to continue the disinfection...

mailvit · Answer

My USB key is created, I'm on it but it asks me to unlock it!

mailvit · Answer

I also have the option "use the command prompt for advanced troubleshooting," is there a solution on that side?

mailvit · Answer

Thank you ... I'm trying ...

mailvit · Answer

I can't download the photos: Done!

Malekal_morte- · Answer

The E partition is already in RAW, so that's not a good sign at all.
Which partition is Windows on?
Check the sizes.

If it's the C partition
try:

bcdboot C:\Windows /l fr-fr

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Please press any key to continue the disinfection...

mailvit · Answer

Réponse :

mailvit · Answer

Windows is installed on C.

mailvit · Answer

There are 3 disks: Hitachi WD Maxtor Windows is installed on WD.

mailvit · Answer

Photo:

Malekal_morte- · Answer

ok reinstall Windows 10 as stated in my first message.
Especially on the disk partition page, do not format.

When Windows is reinstalled, you will need to check the disks, you must have some faulty ones.
The switch to RAW is not normal (unless there was a power cut, etc).

--
Please press any key to continue the disinfection...

mailvit · Answer

I already have a bootable USB stick and I can reinstall Windows, but I can't use the option to keep my applications, settings, and files, so I lose everything!

mailvit · Answer

The Hitachi disk is the newest but it wasn't used; can I reinstall Windows on the Hitachi, based on the photos I sent you?

mailvit · Answer

For now, I haven't done anything... I'm just waiting.
What do you mean by "customizing to get to the partitions"?
Do you mean the choice of the hard drive where to install Windows?
Hitachi
W.D.
Maxtor
?

mailvit · Answer

My initial question was:
why does it say "the drive where Windows is installed is locked. unlock the drive and try again" when I choose the "keep my files" option?
Question:
Is it possible to unlock my boot USB drive?

mailvit · Answer

Well, I am downloading Window-10-media-creation-tool/ on my Samsung tablet from which I am communicating and keeping you updated... Many thanks.

mailvit · Answer

At the end of the download to my USB drive, I get the message Retry, error code 0x80042405-0xA001A Very understandable message!

mailvit · Answer

Avec l'option RUFUS, doit-on télécharger l'ISO sur la clé USB ou sur le disque dur ?

mailvit · Answer

The download of the Windows ISO has just finished on my configured USB key RUFUS and I have a message saying that I need to disable SECURE BOOT for the key to be operational...
When I go to my San Disk 8Go USB key I don't see the SECURE BOOT.
How should I proceed?

mailvit · Answer

Should I choose "install now" or "repair the computer"?

mailvit · Answer

When I choose to save my applications and files, I get the following message: "The upgrade option is not available if you are starting your computer using Windows installation media; If a copy of Windows is already installed on this computer and you want to proceed with an upgrade, remove the installation media and restart your computer. Once Windows has restarted normally, insert the installation media and run the Windows installer."  Remove the installation media? Insert the installation media?

mailvit · Answer

I try, one after another, each partition where I choose "refresh" and not "format", and for each of the partitions, I get the following message:  "Windows cannot be installed on this disk. The selected disk has a partition table MBR. On EFI systems, Windows can only be installed on GPT disks."  What should I do?

mailvit · Answer

When you say we wipe everything, does that mean to format?

mailvit · Answer

Under the step "Where do you want to install Windows", there are 5 options:  Upgrade Delete Format Load a driver Extend  Am I choosing "upgrade" correctly?

mailvit · Answer

Thank you very much for your help, I found all my folders and files as well as the applications in Windows.old Nevertheless, the files were not up to date because, despite the failure of the system image restoration attempt I made before asking for help, it still must have attached the files I had saved a month earlier on my external hard drive!

Malekal_morte- · Answer

Check the hard drive first: How to check the health of the hard drive With CrystalDiskInfo - Download CrystalDiskInfo The status should be blue; otherwise, it's not a good sign. More explanations: CrystalDiskInfo.  ~~  In the future, to avoid losing data, I encourage you to back up your documents. These links explain how to do it: https://www.malekal.com/windows10-sauvegarder-ses-donnees-personnelles/ https://www.commentcamarche.net/faq/29104-sauvegarder-ses-donnees-gratuitement   -- Please press any key to continue the disinfection...

mailvit · Answer

My external hard drive is healthy, the green ribbon for the system image backup went well until the end, and yet, in the end, I got the error code "080042405-0XA001A" ??

mailvit · Answer

Health status "correct" with CrystalDiskinfo ...

mailvit · Answer

"080042405-0xA001A"

Malekal_morte- · Answer

ok good, so it works well.  -- Please press a key to continue the disinfection...

mailvit · Answer

Are automatic backups, on a second disk D:\, configured in "Security update" "backups" "automatically back up my files" reliable? Can this system be used to back up applications and Windows 10?

mailvit · Answer

In this type of backup, are personal files also backed up, just like the Windows 10 operating system?

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