This is currently the most reliable source for "clean" ISOs. Users have uploaded original retail and OEM discs that are preserved for historical use. Always check the "SHA-1" hash of the file to ensure it hasn't been tampered with.

This guide covers everything you need to know about finding, downloading, and installing a legitimate Windows 7 ISO. The Current State of Windows 7 Downloads

Since the primary Microsoft mirrors are no longer active, you have to look toward reputable archives and alternative methods.

Use a tool like Rufus to create a bootable USB, but you still need a safe ISO.

Windows 7 Iso Image Download [portable]

This is currently the most reliable source for "clean" ISOs. Users have uploaded original retail and OEM discs that are preserved for historical use. Always check the "SHA-1" hash of the file to ensure it hasn't been tampered with.

This guide covers everything you need to know about finding, downloading, and installing a legitimate Windows 7 ISO. The Current State of Windows 7 Downloads

Since the primary Microsoft mirrors are no longer active, you have to look toward reputable archives and alternative methods.

Use a tool like Rufus to create a bootable USB, but you still need a safe ISO.