Can I keep my OS when I upgrade my mobo, cpu and ram?

Qub

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Jul 7, 2015
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I currently have a pre-built that came with windows 8 (I'm using 8.1 now) and an AMD a8-5500 processor and some mobo I don't know the name of. I will be upgrading to an i5-6400 and a MSI B150 Mortar Arctic soon and would like to know if this upgrade will require a new purchase of Windows or if i can still use the copy that cam with the prebuilt (I'm pretty sure I have all the needed info about the key). If i can still use the same Win 8, then what will I need to do to prepare the HDD to work with the new hardware?