Hi, my wife's laptop is due for an upgrade... It has vista 64 bit installed on it. I have been wondering as to "how to install w8 on her pc"... because I intend to buy a digital copy of windows 8 or maybe windows 7... If I'm right, in order to install from a digital copy of w8, I'll need to make a bootable USB stick or use DVDs correct? How much space will I need for a w8 install on the stick or dvd? Can I use an "EXTERNAL hard drive" instead (as a bootable drive) ? If so... do I have to format it into fat32? or is there another way? Will I lose everything on that external HDD if I use it as bootable drive? Can't I just run the "image" (iso) that would be located on the external hdd?