Hi everyone.. I'm about to buy Windows 8 pro 64 bit, on DVD with the box, and money-wise it really is time to do so ! I plan to install it on a PC (one only) that I'll begin to build soon. As of now I'm on XP, but I don't own any legit copy of Windows nor a license, and I'm wondering if buying the upgrade version, plus applying the regedit (MediaBootInstall from 1 to 0) will grant me a license ( so I won't have trouble with Windows Update, or with downloading something from their site ) OR do I have to buy the GGK version to get that license ? Both prices are the same here.. One of those two would be a better buy ? sorry if that sounds, well, noobish, but I'd really like to know if I'm mistaking anywhere if I choose to go with the GGK version Thanks in advance for your precious piece of advise about my case !