I have a Lenovo Ideapad Flex 14 that I'm attempting to load Windows 8.1. I've installed a new hard drive. I have a Windows 8.1 DVD and a bootable USB drive. The laptop will not see the USB DVD drive when the boot menu is displayed. I've disabled UEFI and am using Legacy boot. I can boot to the USB drive but I click next I receive the error, "We could't create a new partition or locate and existing one...." In the past I've gotten around this message on other machines by using the Boot DVD but on this machine it refuses to see the optical drive. I've ensured that Boot from USB is enabled within the BIOS. I know the USB DVD drive works also. I know that the Win 8.1 DVD works. I've tried different USB ports on the laptop all to no avail. Please help. Thanks in advance.