You can still buy legitimate volume license keys from authorized resellers (though Microsoft pushes newer versions). If you already own a license:
Disclaimer: This article describes a specific Microsoft Volume Licensing product. Ensure you have the proper licensing before installation. If you'd like, I can: You can still buy legitimate volume license keys
The 64-bit version takes advantage of modern hardware-level security protections built into newer processors. These features include Data Execution Prevention (DEP) and Kernel Patch Protection. Deployment and Installation Methods You can still buy legitimate volume license keys