Hy! So I got w7 64xbit, but when I put the dvd in with it it won't boot (yes i changed the boot order), but when i copied the .img file on the usb and set to boot usb first, only "missing operating system" appears. I also have 32xbit proffesional wich boots and install's without problem. I have an acer aspire 5738zg and i checked and it's compatible but i don't know why it won't boot 64xbit installation. I tried 3 different instalation disc's and non work