How to add Windows Boot Manager into UEFI BIOS setting boot priorities boot option #1?

Hi, I just received my new Dell Inspiron 14 7000 series laptop less than 2 weeks ago.

When I do a clean installation of Windows 8.1 Pro on my laptop, I deleted all the 'factory settings' partitions, and made it 50:50 C Drive & D Drive.

After I done the clean installation, everythings seems ok. I restart my laptop, then when after the Dell logo & turning dots, the screen became black, & showing some words in the middle like 'searching for media...... bla bla bla - 3 lines'. Then it goes into windows 8.1.

After that, when I check inside the UEFI BIOS settings, the factory setting of Boot Option #1 suppose to be 'Windows Boot Manager', but it wasn't !

It was left with Boot Option #1 & Boot Option #2 only, the 'UEFI: IP6 Realtek PCIe GBE Family Controller' & 'UEFI: IP4 Realtek PCIe GBE Family Controller'.

Can someone help me to restore the 'Windows Boot Manager' back to Boot Option [tag:1_3F00_] Why is it missing???

When I want to add the boot options, there is no Windows Boot Manager inside the add boot options list!

Can someone help me with this??? Any helps will do!