Help with GPT, UEFI, Windows 7 Install...

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http://hardforum.com – Hi everyone, I'm having a bit of a nightmare trying to set up a HTPC for a friend of mine. I am using an old Dell Optiplex 780 SFF box, and swapped the hard disk for a 4TB drive. When I try to install Windows 7 from a USB key onto the drive, it tells me that I can't install it on the partition because it's a GPT partition. I have done a few hours of troubleshooting and googling and it seems like it should be fine provided the computer is booting in UEFI and not BIOS. The problem is I have no idea if it actually boots in UEFI mode or not and I cannot find any options for this in the BIOS set (Hardware)