The Get Genuine Kit (GGK) helps your customers install genuine Windows software on their existing PCs. I want just to make a clean install (no previous windows installed in my SSD) and what version to buy ? The 64-bit OEM or the 64-bit GGK ?. And can I later use the code I get from Windows 7 GGK to activate Windows 10 when I upgrade to it? This thread is locked. Microsoft Windows 10 Pro, 64-bit, GGK, DSP, ENG 4YR-00257 from Technoworld.