hi there. i have a Window 7 home premium DVD. it contains both 32 and 64 bit. I created an ISO on a win 7 MacBook Pro that belongs to my friend (im not sure his win 7 is 32 or 64 bit). then, i created a USB bootable from the ISO (using bootcamp 4 on my macmini 2011). I did so because i want to install win 7 on my macmini 2011. now, my question is, how can i opt for 64bit? i cant utlizie my RAM fully with 32 bit. i reinstalled 3 times already and its 32bit all three times. The last time i installed, i really paid attention throughout the installation process to see whether there is any way i can choose 64 bit, but i didnt find any. how can i do that? do we choose: 1. when creating the ISO? (the only step i havent try, after knowing about 32 vs 64 bit) 2. when creating the USB bootable using bootcamp? ( i tried this. didnt find a way to choose) 3. during installation? (i tried this 30mins ago. didnt find a way to choose) i also checked my processor: Intel(r) Core (TM) i5-2415M and made sure it can run 64 bit. so basically, i tried everything i could. HELP! my macmini runs Mac OSX Lion. I realized the difference between 32 bit and 64 bit when i found out there 1880MB of hardware reserved RAM in the Win 7 that i installed in the partition.