I bought a pc a few years back before Windows 8 was released so it had Windows 7 but for $15 you could buy Windows 8. I paid the $15 but have never installed it...just kept using Windows 7. I just got another pc but it does not have Windows installed. My question is, will I be able to install the Windows 8 version that I bought for the old pc onto the new pc without any issues? Im afraid if I do that it might invalidate my old pc that has Windows 7 installed. Thanks for any help.