Reboot the PC in legacy BIOS-compatibility mode. The selected disk is not of the GPT partition style”, it’s because your PC is booted in UEFI mode, but your hard drive is not configured for UEFI mode. When installing Windows on UEFI-based PCs using Windows Setup, your hard drive partition style must be set up to support either UEFI mode or legacy BIOS-compatibility mode.įor example, if you receive the error message: “Windows cannot be installed to this disk.