When you go to amazon.com and look for a windows 7 64 bit i need a 64 bit by the way not a 32 bit because i have 16gb ram and need to utilize it, there is a windows 7 home premium that costs 200 bucks but right now is a bout 160 on sale, then there is the windows 7 that is 99 dollars its that dvd builder pack and im gonna have to guess the one that costs 200 dollars is the one i need, i want to remove my windows xp32 bit and install windows 7 64 bit full version, can someone please give me a link to one i can digitally buy or even on cd i just want to make sure im getting the correct one