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#21
To get to the "boot menu" where you can decide what device to boot from.... press the ESC key (or F9 key in rare cases), on an HP computer. Once on the boot menu, you can choose to boot from the optical drive (CD).
The nice thing about the boot menu is that it's only a one time choice. The next time you boot, it will go back to booting from your Windows drive.
On the "boot menu" you may see TWO optical drives. One saying UEFI and the other without the UEFI.
You might have to try both, one at a time, as I don't know if your setup is MBR or GPT.
For example... here's what MY Boot Menu looks like...