Setup a Microsoft Account and link your current PC to it , then backup whatever you want to save and perform a clean install on your new setup and activate it with your Microsoft account from within windows.
https://www.microsoft.com/en-us/software-download/windows10/
Create a USB installer here ^
[video="https://www.youtube.com/watch?v=u4ROoOkPWIM"][/video]
[video="https://www.youtube.com/watch?v=FP4sAhmH_Oo"][/video]