I recently attempted to install Windows 10 as a dual boot alongside Ubuntu 14.04. I used WinUSB to create a bootable drive. I booted into the USB, but when I attempted to select the empty NTFS partition I created for Windows, I received the following error message: "Windows cannot install to this drive. The drive is of the GPT partition style." I know that Windows requires a GPT drive when the system boots in UEFI mode, so I've come to the conclusion that mine was not. However, when I disabled Legacy support in the BIOS menu, the USB with Windows on it disappeared from the boot menu. I know my motherboard, an ASUS M5A97 R.20, is UEFI-capable, so what is causing this problem?