The restore varies with each make machine. For a Compaq, I put the restore CD in the drive and turn the machine on. From there I follow the prompts.
But your post didn't tell what machine you had or if you have restore CDs.
I need to do a complete restore on my computer because it's not operating as well as it should. I have the discs to do it. But my concern is that i recently replace my Phillips CD-RW drive with a AOpen drive (which I never heard of until the shop installed it), will that have any effect on the restore to the manufacturer's setting? I hope i'm making sense. Thanks in advance for your response.