Hi, I am Dave, I will help you with this.
Boot your system into BIOS and ensure it is in UEFI Mode with Secure Boot disabled, then check if you can see the target drive.
If not:
At the very start of the Installation Process, press Shift + F10, or Shift + Fn + F10 to open Command Prompt
Run this command and hit Enter:
diskpart
Run this command and hit Enter:
list disk
(Make note of the disk number you want to convert and enter it into the next command - replace X)
Run this command and hit Enter:
select disk X
Run this command and hit Enter:
clean
Run this command and hit Enter:
convert gpt
Then close Command Prompt and try the installation again.