Get ready for Windows 11, version 26H2

While I think it’s fantastic to see a kid learning about his computer and using resources on the Internet to figure out what he needs to know, I do hope your parents have you behind a solid firewall and DNS service and know every time you’re communicating with people on the Internet! 

To answer your question, I can’t quite tell from your message and image what the issue is, but it sounds a lot like your machine can no longer boot Windows 11, either because the hard drive it’s installed on has failed in some way (which is likely the case if it was working just fine and suddenly stopped), or if you made any system changes, like trying to reinstall Windows and it failed somewhere along the way, booting to other tools or operating systems (like Linux) and did something to mess with the partition structure Windows was installed to, or if you went into the system firmware/UEFI (formerly called BIOS) and made any changes to the boot order or other related settings (this would be that menu that you have to get into when you first turn on the computer and press a key like F2/F10/Del before it tries to boot up).

Assuming you didn’t make any changes to cause this (and assuming you don’t have any files or information saved on the PC you can’t live without), this will walk you through getting Windows downloaded/reinstalled on that device:

1. On a working PC (obviously), go to: 

   https://www.microsoft.com/en-us/software-download/windows11 then under the “Create Windows 11 Installation Media” section, click Download.

2. You’ll need a USB drive you can completely erase that is at least 8GB or larger, so make sure you have this available first. Once you do, plug it in, then launch the “MediaCreationTool.exe” program that you downloaded above.
3. Walk through the tool (it’s very simple and tells you exactly what to do) to download Windows 11 and use your USB drive you plugged in (that you don’t mind being erased) to create a Windows 11 setup drive. When it’s completely finished, safely eject the drive and unplug it from the PC you set it up on.
4. On the PC you’re having this issue on - with the PC powered off first - connect the USB drive you setup for installing Windows 11, and be prepared to press the appropriate startup key for your PC manufacturer to open the “Startup/Boot Device Menu”. Whatever the key is, you will want to power the PC on and immediately start pressing the startup device key once every second while the PC powers on until it finally shows you the boot device menu. Here’s a few brands for reference on what key you might need to press:
   • For HP computers, pressing F9 repeatedly after powering the machine on
   • For Dell or Lenovo computers, press F12 repeatedly after powering on
   • You can look up your brand’s device boot menu key if you need to
5. Once you’re in the device boot menu, you should be able to select the USB device that you setup earlier and when you highlight it and hit Enter, it should begin booting what looks like Windows at first, then you should get to a welcome/startup screen where you can proceed to install Windows, and eventually, you’ll be asked to select which disk to install/partition for Windows. NOTE: Performing the next step will ERASE YOUR ENTIRE DISK so no data you have saved to it from before when it was working will be accessible. If you have important files you need to try and recover, then there are other measures you need to take to try and recover your drive’s contents before proceeding.
6. If you don’t mind erasing/starting over from scratch, then continue by selecting each of the partitions on “Disk 0” (which should be the hard disk detected inside of your machine, assuming you only have one, plus the USB drive of course, which you do NOT want to install to obviously) and click “Delete this partition” at the bottom until they’re all deleted and Disk 0 shows only one line, as “Disk 0 Unallocated”, meaning it has no partitions left on it. This will ensure a clean installation that doesn’t potentially leave behind any unnecessary extra partitions. Once your hard disk is fully clear of partitions, make sure it is selected as your destination to install Windows to, and click next through the process, and it should begin doing it’s own thing - Copying files, installing files, and you’ll then see several reboots as it boots into the newly installed Windows for the first time, sets up devices, then reboots again and finishes setting up Windows.

Assuming everything worked as expected, you should end up on a fresh login/setup screen like you normally see on a brand new computer, where you enter in the computer name you want to assign, optionally sign-inn with your Microsoft account, etc., and then eventually you’ll be logged back into a usable Windows computer, with nothing but the default apps present.

You can then reinstall everything you need, and hopefully that will take care of everything. I’m hoping you were logged in before with a Microsoft account so your activation/license for Windows will be backed up on your account and it will reactivate on its own, otherwise you might need to contact Microsoft about your license restoration. 

If the process seems to randomly fail/freeze/reboot or not continue after rebooting as expected, even after retrying this process multiple times, then your disk drive may in fact be failing and this is what caused the boot failure to begin with. If so, you’ll need to purchase a new hard disk (well, ideally solid state disk/drive) and replace the one inside with the new one, then reinstall Windows again using the process above to the new disk.