The Windows 7 Professional 64-bit ISO is a disk image file containing the full installation setup for Microsoft’s 2009 operating system, specifically the Professional edition (which includes features like Remote Desktop Host, Domain Join, and Encrypting File System). The 64-bit version supports over 4 GB of RAM and is required for modern processors.
Microsoft no longer provides public downloads for Windows 7 ISOs, but they once offered them via the Software Recovery page (requires a retail key). That page has been shut down. windows 7 pro iso 64 bit