I upgraded from windows vista 6 months ago and i bought a family pak of 3x of windows 7 home premium. I used all 3 copies that came with it on my different computers. i want to build a new puter from ground up and install an ssd and use my old HDD to. Will i be able to use the windows 7 disk again even though i used all 3 installs? Would i be able to activate it on the new build ordo i have to buy another copy of Windows 7... Seems stupid that i cant keep using it over again and not have to but a new OS of windows 7...Thanks