Sometimes you need to boot from a CD in order to fix or upgrade your computer. The problem is, most computers are set to boot from the hard disk, without trying to boot from a CD. Getting your computer to do this can be convoluted, so follow these steps to make sure that you boot correctly. 1.Insert the Disk 2.reboot Your computer 3.goto Bios setup. 4.In boot menu set CD/DVD player as primary device to boot. 5.Then save the changes.