Hello I have a few questions about upgrading. So I want to upgrade my 32 bit Windows 7 to a 64 bit version but I don't have any disks. Do I just buy a certain type of Windows 7 that's 64 bit and put the disk in and it will override my 32 bit version? What 64 bit Windows 7 version should I get? And would it automatically install the 64 bit version if my computer can handle it? Thank you.