Back when I purchased my refurbished PC from TigerDirect, I received a Windows 7 Home Premium start-up disk for Refurbished PCs. However, when I received the computer, the OS was already installed so I did not have to use the start-up disk. Currently, I am building a gaming PC and I was wondering if it is possible to use this unused disk as my OS. I do have the Product/Activation Key from my old refurbished PC. So would it be a matter of installing the OS on my new computer and putting the activation key from my old PC onto my new one? I contacted TigerDirect and they said it is possible. I would just like further confirmation from someone who may have had the same question/problem as me.