And if so I guess you'd need a key for it. I'm just debating on wether or not to get another OEM win7 64-bit (Its super cheap) or just install from the disk I have now though I'd have no way to activate it.
If your using it on the same motherboard you do not need a new code. But if you are wanting to install it on a different motherboard then you will need a new key code. the disk should install the OS you just wont be able to activate it.