Hey, im very confused. I'm currently running windows 8.1 on my pc, and i want to upgrade to windows 10, do i select the usb flash drive option or do i download the iso file which i need to put in rufus later. I want to install windows 10 on my current pc, not on another, and i have 1 ssd and 1 hard drive. I want the files to stay on the hard drive, so do i just unplug it? I also want windows to be installed on my ssd. Will it automaticly be installed there if its the only storage unit plugged in the motherboard or no?