Hasleo WinToHDD is a powerful and user-friendly software tool that allows users to install Windows on a computer without the need for a bootable USB drive or CD/DVD. The software supports the installation of Windows 7, 8, 10, and 11, and can be used on both BIOS and UEFI systems. With WinToHDD, users can easily perform a clean installation of Windows on a computer, even if there is no existing operating system installed.