Grayed-Out Legacy Boot Option in the BIOS In Dell Laptop - Fixed

[@kartikpateria]

I'm having trouble with my new pc, i have zebronics motherboard and whenever i trying to on it, then it shows bios menu and installed windows 10 on my pendrive, so if i trying to select windows boot option ok boot option #1 then there's only 2 options, 1st 1P4 realtek PCIe GBE Family controller, 2nd 1P6 realtek PCIe GBE Family controller so sir please tell me what i have to do...??