In order to install a new operating system on a computer, you can make a bootable DVD that includes the software to install the new system, put it in the DVD/CD reader, and reboot your computer. If all goes well your computer will boot off the DVD/CD reader and then you follow the install process and there you go.
But sometimes this doesn't work. The most common reason is that your computer is not configured to boot from the DVD/CD reader first (if it has a bootable disk in it). You have to go into bios and change the "boot order" so "boot from DVD" is on top of the list, above "hard drive…
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