Do I need to uninstall Windows for an upgrade?

I'm thinking of upgrading from a 1150 socket mobo and i5 4440 when 8GB of ddr3 to a z279 mobo, i5 7600k and 8/16GB of ddr4.

Will I need to reinstall windows when I upgrade and if so how can I get the license key as it is a prebuilt system.
Reply to cubingminer8
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  1. Best answer
    Technically you could just swap the components but your OS would be very unstable so yes, you absolutely should reinstall windows.
    The licence key should be somewhere on the case, a shinny sticker with a 25 digit code on it.
    Reply to grana92
  2. Ok, thank you. I'll have a look later for the sticker.
    Reply to cubingminer8
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