hi i've a ideapad z580 with windows 7 home besic. now i've bought windows 8 pro & wat to install it in my pc from usb. problem is whenever i try to boot from usb it just bypass it and go stright to windows 7.I've already checked my USB in my pc and it is bootable. so i've read different forums & every one is saying to disable SECUREBOOT option... now is my bios there is no secure boot option even if i enable administrator password i cannot find any SECUREBOOT option... so what shout i do with my windows 8 pro? how do i install it?my laptop is ideapad z580 with i3-3110m ... bios version is 5fcn34ww