Hi,
Boot again from the windows bootable pendrive
and open up the Command Prompt
run the following commands by pressing Enter after each one:
diskpart
list disk
select disk 0
list vol
list partition
select partition 1
delete partition override
create partition efi
format quick fs=fat32
assign letter=s
(The letter "s" refers to the assigned letter. You can use whatever letter you prefer)
exit
bcdboot c:\windows /f UEFI /s s:
exit
Restart Windows