OK so im practically getting a new system except my psu (its the newest part in my system atm) and my hard drive ive heard some people saying its installed on hard drive not motherboard so i wouldn't others saying because its a new system it will need to be reinstalled and my second question is will i need to reactivate windows (ive heard it mentioned that you nearly always will need to) but my main question about this is to activate it do i need the install disk and the Key or just one of the two?