The computer is booting in Bios/Legacy mode. You'll have to go in to the preboot setup and disable legacy boot; if the computer supports it.
If it doesn't... try making a bootable media that supports legacy boot methods.
Manjaro is a GNU/Linux distribution based on Arch. It is a rolling release distro which includes a user-friendly installer, tested updates that try very hard to not break your system and a community of friendly users for support. Official releases include Xfce, KDE, Gnome, and the minimal CLI-Installer Architect. Community releases include Awesome, bspwm, Budgie, Cinnamon, Deepin, i3, LXDE, LXQT, Mate, OpenBox and builds for ARM devices like Raspberry Pi, Odroid etc.
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The computer is booting in Bios/Legacy mode. You'll have to go in to the preboot setup and disable legacy boot; if the computer supports it.
If it doesn't... try making a bootable media that supports legacy boot methods.