How To Get Ryzen Working on Windows 7 x64
 

Officially, AMD does not support Ryzen CPUs on Windows 7. Given that Microsoft has essentially ended support for the OS, this is the type of response we expect from AMD – Intel has also stopped officially supporting Windows 7 on the newest platforms as well. 'Official' is a general term: some special customers may receive extended lifetime support, or drivers currently out in the ecosystem still work on the platforms. Official support refers to driver updates and perhaps security updates, but there’s nothing to stop you trying to install an OS to either system or platform.

For clarification, we did not converse with AMD in writing this piece. AMD's formal position on Windows 7 on Ryzen is that it is unsupported, and as a result this means they will not provide support around it. There may also be other methods to install an unsupported OS, however here are a few solutions.

http://www.anandtech.com/show/11182/...-windows-7-x64