I am trying to install a new asrock z77 motherboard into my old set up. I'm going to use the same hard drives and CPU. I also want to upgrade from windows xp 32bit to windows 7 64 bit. I have a sata to USB adapter so that I can plug my hdd into the computer and remove files but I'm not sure if there's a way to wipe the whole thig afterward so that I can start from scratch. Do I even need to, or is there another way?