Finding a reliable, untouched can feel impossible today. Microsoft officially ended support for Windows 7 in January 2020. This change removed official digital download links from their main website.
Microsoft officially removed all direct download links for Windows 7 ISOs after its end-of-life period. Users now rely on community-maintained archives: index of parent directory windows 7 ultimate iso exclusive
If you must use Windows 7, disconnect the machine from the internet permanently and use it only for offline tasks. Finding a reliable, untouched can feel impossible today