Do I have to reinstall windows?

Hello,

Don't really know if this is the right place to post this... But anyway, I bought a prebuilt pc about 2 years ago and now I am going to be upgrading it. I will be upgrading the cpu and the motherboard. My question is it when i upgrade the cpu and motherboard do I have to buy a whole new windows 10 key or since I have a prebuilt system will I just have windows 10 still? This is probably a dumb question.

Thanks,

I didn't find the right solution from the internet.
Reference: http://www.tomshardware.com/forum/id-352...ll-windows.html

Infographic Animation Example

On Windows 10, this option is the only New Name of this PC. You can restart your PC and store all the personal files and applications of the Windows Store, or reset your PC to wipe everything from your disk. Eithewill allow you to reinstall Windows from here, clearing all the junk provided by the manufacturer. It should be as good as installing Windows 10 from the start.