If you need to install Windows 7:

Security firms have analyzed "Windows Loader" variants and found:

If you decide to use Windows Loader 2.2.1 or similar tools:

Windows Loader 2.2.1 is a software tool designed to bypass or circumvent the activation process of Windows 7. It works by emulating a genuine activation process, making the operating system believe it has been activated through official channels. This tool gained popularity for its simplicity and effectiveness, but users should be aware of the implications.