Hi all, I just bought a laptop with Win8, and I would like 8.1 with Media Center. Can I use the key of Win8? I will find any driver issue with the hardware? Will I lose the warranty? I've read some sticky, but still I'm confused, should I install the one from /53855-Windows-8-1-with-Update-ESDs-Repository, right? Directly upon Win8? And if my Win8 key doesn't work, can I activate it with /28669-Microsoft-Toolkit-Official-KMS-Solution-for-Microsoft-Products and be able to download updates? Thank you.