Using bootable Win 8.1 USB or DVD


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I am now using Win 8.1.1 Pro.

I upgraded from Vista to Win 8 Pro, then to Win 8.1 Pro via Windows Store.

 

I have created a bootable Win 8.1 USB and a bootable 8.1 DVD.

 

My question is ......

If I need to use it to re-install Win 8.1 in the same machine, does it ask for product key ?

If yes, do I use the Win 8 key, or do I have to use a generic key to install and then change it to the real Win 8 key afterwards to activate ?

 

Thank you.

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