Problem regarding windows 8 product key and bootcamp

hello.
I installed Windows 8 Pro (OEM) on my MacBook pro 13-inch mid 2013 retina display through bootcamp. Upon starting the setup procedure, Windows started freaking out and squashed most of the screen to the side. I managed to blindly stumble through the installation, before rebooting into OSX and attempting to install the bootcamp drivers through Parallels 8, which I set up to access the bootcamp partition. I was unable to installed the drivers, but I used Windows through Parallels for a bit to achieve the work I needed done. A week later I finally installed the drivers in Bootcamp by pugging my MBP into my TV and navigating through that. After finishing, settings told me that Windows needed a product key and the one I had used to install was in use by another computer. However, running Windows through parallels, it states that everything is registered fine. I assume that the parallels copy is using the product key, while Bootcamp is not. Is there any way to change that? or could someone please tell me how to remove the product key from parallels.

This link explains how to uninstall the product key on a conventional installation
http://www.howtogeek.com/124286/how-to-uninstall-your-windows-product-key-before-you-sell-your-pc/
when I tried this on parallels it gave me a whole series of error

Any help would be greatly appreciated,
thanks