If you download an original Windows 7 RTM (Release to Manufacturing) ISO from 2009 or even SP1 from 2011, you are setting yourself up for a technical nightmare. Here is why:
Before providing sources, we must address the elephant in the room: windows 7 fully updated iso
However, there is a massive problem facing those who need to reinstall Windows 7 today: If you download an original Windows 7 RTM