I have one PC backed up using Norton Ghost 14. I've since made up a Home Network and added two other PC's. All three PC's are running Windows XP. I've tried to read the Ghost 14 EULA but I can't decide if I need Ghost 14 on all three PC's or not. Is it legal to install Ghost 14 on PC #1 and use that to back up all three PC's to an external drive? Would I be better off buying the newer Ghost 15?