04-06-2015, 07:46 AM
Windows can only be installed to GPT partitioned disks if the computer is using UEFI firmware and booting in UEFI mode. Why? I have no idea. Since your computer has the older BIOS firmware, Windows will only install to drives formatted with traditional MBR partitions. Again, I have no idea why they limit it's installation that way, but there is nothing you can do about it.
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