Creating EFI partition using command prompt.
Step 1: Boot computer using the Windows Installation Media . Step 2: On the first screen press Shift + F10 to bring command prompt. Commands : diskpart list disk select disk ( Note: Select the disk where your windows is installed.) list partition select partition ( Note: Select the Windows operating system partition.) shrink desired=100 ( Note: The amount shown in MegaByte.) create partition efi size=100 format quick fs=fat32 assign letter=s list partition list volume exit bcdboot C:\windows /s S: ( Note: you can change "C:" drive letter if you have a different one) Windows will copy boot files from its windows partition to the efi partition and create a BCD store in the same partition. Finally, Remove the Windows Installation Media and restart.