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In order to install to an MBR disk on an EFI BIOS you 'll need to enter BIOS setup and either remove EFI Boot disk from Boot Order listings, or look for a setting for Legacy BIOS instead of EFI. Disk - Clean and Clean All with Diskpart Command
Otherwise you'll need to wipe the HD with Diskpart CLean Command followed by the command Convert MBR, then install using these special steps for EFI BIOS: UEFI (Unified Extensible Firmware Interface) - Install Windows 7 with