Your PC might mistakenly detect external drives, removable media (USB devices or non-bootable discs), etc., as bootable devices and attempt to boot from them. In this case, remove or disconnect ...
I'm aware about MsConfig's settings to do with 'No GUI Boot', 'Boot Log' and 'OS Boot Information'... However, no matter which combination of these I select I cannot get Windows 10 to display a list ...
If VirtualBox is not booting from ISO or if GParted ISO is not mounting, correct the Boot Order in System Settings and verify ...