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Ubuntu is working on the PC but I want to sell the PC with original Windows XP Professional Edition. I cannot boot the CD. Rebooting and selecting "Start from CD" always starts the installed Ubuntu. I wish to format the hard disk and do a clean Windows XP installation to sell it.

How can I do this?

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Are you re-booting PC, and stopping at BIOS with (typically) F9 to choose boot device? Does it work if you choose CD-drive, at that point? – david6 Jun 29 '12 at 4:33

Put the xp cd.

Open BIOS by pressing F12 or Del (As per your motherboard, see the corners of flashing screen just after starting the computer)

There will be a menu as Boot and inside that there should be boot priority. Set the dvd/cd driver as first option.

Save and exit.

If it doesn't boot probably the disk is damaged.

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you're missing this step: set fire to the xp disc get windows 7 basic, put the w7 dvd isntall it, better than xp and it's newer. – Uri Herrera Jun 29 '12 at 4:38

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