What theog is trying to say is that you have a UEFI BIOS:
The 30-year-long Reign of BIOS is Over: Why UEFI W... - Input Output
Technical Note: UEFI BIOS vs. Legacy BIOS - YouTube
It requires the special steps shown in UEFI (Unified Extensible Firmware Interface) - Install Windows 7 with - Windows 7 Forums
If you don't feel it confers enough advantage then you might find it easier to Bypass UEFI to Install Win7
Let us know what you decide, and how it works for you.