Goal: a clean installation replaces the existing Windows installation with a fresh copy from bootable media. It can solve severe software corruption and is useful when repurposing a PC, but it can also erase applications, settings, and data if you choose the wrong partition. This guide focuses on preparation, disk identification, activation, drivers, and recovery so that the reinstall is deliberate rather than destructive. Quick steps Back up every file you cannot replace and verify that the backup opens. Save your BitLocker recovery key and note the Windows edition currently activated. Create official Windows 11 installation media with Microsoft’s tools. Boot the PC from the USB drive in UEFI mode. Choose the correct edition if Windows Setup asks. Identify the target system disk carefully before deleting or formatting anything. Install Windows, complete initial setup, run Windows Update, then restore apps and data gradually. Expected result: Windows 11 starts from a clean system i...