I am wanting to build a Ryzen 7 system, but DO NOT want to use Windows 10! Is it OK to use windows 7 and will M.2 work with it if I can Use Windows 7?
Microsoft does not support Windows 7 with Ryzen processors.
I've never had to do any of this stuff myself so it would be best to do some research first. Black_Zion seems knowledgeable about M.2 drives.
How to Install Microsoft Windows* 7 on a PCIe* NVMe Intel® SSD
Samsung 970 PRO M.2 512GB NVMe SSD review - Installation & Recommendations
To get Windows 7 updates with Ryzen and Kaby Lake
DLL patch unlocks Windows 7, 8.1 updates on Ryzen, Kaby Lake | bit-tech.net