Does this mean that there is only the 32bit version on the DVD? Would there be a way to make it 64bit?
Sun, for me your attached picture is not showing ... When Microsoft released Vista you either had a 32 bit DVD or 64 bit DVD, they did not have both on one DVD. The DVD's contained all the different versions of the OS (basic, home premium, ultimate, etc.) and depending on your product key is what was installed on your system.
So, if you want 64 bit Windows 7, you will need the appropriate RTM or released DVD.