Lost UEFI when reinstalling Windows 10

I have a laptop that had Windows 7, but was upgraded to Windows 10 with the free upgrade option.

Everything was getting really slow and full of unneeded software, so I decided to do a clean reinstall Windows 10. I downloaded a copy of Windows 10 to a USB drive as directed here: Download Windows 10

But I couldn't boot from the USB drive unless I turned off UEFI and the "secure mode" settings, and instead used the legacy BIOS boot settings without "secure mode".

I then deleted all partitions and reinstalled Windows 10 on the new blank memory.

Eveyrthing went fine, but when I try to change the settings back from legacy BIOS to UEFI it says there is nothing to boot. It only works when in legacy BIOS mode.

I want my installation to be very secure from hacking, so how can I reinstall the UEFI settings so I can turn the secure mode back on?

I have no idea how all this stuff works - but from Googling I think I messed up by deleteing the partition that held the UEFI setting. Any way I can reconfigure that and fix what I did?

I do believe you made the error of selecting the first one (BIOS or UEFI). It won't boot in UEFI, <<no boot device was found>> will be shown. You will get the same result with Ubuntu or Opensuse. Second and third option works.

Got it working thanks guys!

I used the same boot USB I had before, but this time I selected UEFI for installation in the boot menu. I must have misse that somehow the first time around.