I have a quick and maybe stupid question but i was wondering: if i buy windows 10 home on my laptop which already has windows, what will happen? Will it give me a product key that i can use on my first PC build? Will it try to activate it yet fail since i have windows and waste my money? What will i be getting is basically what i mean, and will it expire if i dont use it for a week since im building my PC in a week. Help! thanks