If you want a totally fresh start or are installing on a new computer, you need to turn that ISO into a bootable USB drive. Download Rufus: Use a tool like to burn the ISO to a USB drive (at least 8GB). Create Bootable Media:
Happy haunting. And remember: Have you tried turning it off and on again? In this case, don’t. The power button might just nod back. windows 121 iso file install
As of my latest knowledge update (May 2025), Windows 121 does not exist as an official Microsoft operating system. The latest stable versions are Windows 11 (version 23H2/24H2) and Windows 10. This article treats "Windows 121" as either a typo, a future theoretical version, a niche enterprise build, or a colloquial term for Windows 11 version 21H2 (the original 2021 release). The installation process described below follows the standard ISO method for any modern Windows OS. If Windows 121 is ever released, the steps will be nearly identical. If you want a totally fresh start or
: Decide whether to keep personal files, settings, and applications. And remember: Have you tried turning it off and on again
Once the files are copied, the PC will restart. Follow the "Out of Box Experience" (OOBE) to: Select your region and keyboard layout. Connect to Wi-Fi.
: Choose between an Upgrade or Custom installation.
Your Windows 12 environment is now fully configured and ready for production.