Hi everybody: I have a littte question. A time ago I installed windows 7 home premium 32 bits in a laptop that cames with W7 home edition. I am going to upgrade to W10 but because I have 2 sticks of 2g Gskill ram, previosly I want to install de 64 bits version of H. premium. Can I use the same certificate and key for it that when I install the 32 version of Home premium. Fresh install of course bebore upgrade to W10. Thanks. the certificate is the same that come with the laptop.