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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