BIOS and UEFI boot on MBR disk (Win8/8.1)
You don't really need GPT to experience your motherboard's UEFI, and this video will show you how.
1. Create the boot file on your main OS drive (C:) and set it as Active, so Windows wouldn't need that small partition to boot, and thus allow us to work on it.
On Elevated Command Prompt, type:
bcdboot C:\Windows /s C:
2. Reboot, then format the small partition as FAT32 and set it as active. Don't forget to assign a drive letter (such as D:) for it so we can work on it.
3. Create the boot file for both BIOS and UEFI boot on that small partition and set it as Active.
On Elevated Command Prompt, type:
bcdboot C:\Windows /s D: /f ALL
4. Enjoy. :D