Select تشغيل نظام التشغيل المثبَّت to start the system installed on your local hard disk. This system must be installed properly, because only the MBR (Master Boot Record) on the first hard disk is started. The device ID of the first hard disk is provided by the BIOS of the computer.
Use this if you forgot to remove the CD or DVD from your drive and want to start the computer from the hard disk.