If you are running Windows 10 and want to move to Windows 11 (or just reinstall your current version to fix bugs), you can use the Windows Media Creation Tool .
If you cannot or do not want to use a USB drive, several alternatives are available depending on your current system's status: do you need a flash drive to install windows
While a USB flash drive is the most common tool for the job, you do strictly need one to install Windows . If your computer is already running an older version of Windows, or if you have access to internal storage partitions, you can perform a clean installation or an upgrade using built-in software tools. If you are running Windows 10 and want
If your computer is already functional—meaning it turns on and loads into Windows or another operating system—you do not strictly need a flash drive. You can install Windows directly from within the system. If your computer is already functional—meaning it turns