The newer UEFI type BIOS prevents you from:

Booting your computer from a CD or USB;
Remove Windows 10 and replace it with Linux or an earlier version of Windows.

Fixing the Problem:
Enter BIOS;
Go to Security;
Disable Secure Boot;
Go to Advanced;
Go to System Configuration;
Change Boot Mode to CSM Boot;
Go to Boot;
Set your preferred Boot Order.