Asus Laptop: BOOTMGR is Missing how to fix?

Enter your BIOS Setup Screen by pressing the key that appears on the screen. It's usually Delete, F1 or F2. Think its F2 for Asus, not too sure. Keep tapping the key as soon as you turn On the laptop. In BIOS, change the boot priority order, so that the DVD Drive comes first, before the Hard Drive. Follow one of these guides to fix your BOOTMGR problem.