To further expand my question, I plan to dual-boot Windows 8 and Ubuntu together using Windows Boot Manager over GRUB. However, I would always like a way for me to completely undo everything I did to dual boot my computer.
Luckily, I have found a resource that can help me. However, this requires me to have to have the Windows 8 installation disk. My question is, because I don't plan to uninstall Windows but just Ubuntu, do I need the Windows 8 key to restore items?
I am worrying about the Windows 8 key because when my computer was pre-built from ASUS, it came with nothing other than the computer and the required cables. I did use Belarc to retrieve my product key, but there was a side note: "This may be the manufacturer's factory installed product key rather than yours".
So technically there are two questions that I have, do I need to get my Windows 8 key in order to restore it, which I would like to get answered here, and if possible, if I were to input the manufacturer's key in the Windows 8 installation, what would happen?