: Ensure your hardware has at least a 1 GHz 64-bit processor , 2 GB of RAM , and 20 GB of hard drive space .

: Windows 7 no longer receives security updates from Microsoft. If you use it, be sure to keep it behind a strong firewall and avoid using it for sensitive tasks like banking.

: If you buy a digital key only, you may need to download a bootable ISO image from a source like the Internet Archive and use a tool like Rufus to create a bootable USB drive.

(includes both 32-bit and 64-bit) for about $124.99. View various options on eBay . Specialty Software Retailers : Some sites like Sealevel list Windows 7 Professional 64-bit Go to product viewer dialog for this item.