I'm buying a ssd for my pre-built PC and I want set it as my boot drive. I don't have the windows key as it didn't come in the box or on the PC once I got it. However I an running windows 10 home with an oem key (I just don't know it). will I need to buy a new windows key for my PC? or will I not even need a key as I've read that it might not even ask me for a key if the oem key was already installed on my motherboard.