How do I backup the pre-installed Windows that came with my laptop?

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http://askubuntu.com – I would like to buy a new laptop in the near future on which I would like to install Ubuntu. The sad truth is that most of the laptops - including the one I'm looking at - come with an installer of Microsoft Windows for which I'll have payed. There is an option to try and ask for a refund as explained here, but that seems very time consuming with high chances of failure. I'm thinking of another option, which is to make a backup of the OEM installation disk and then later, in case I wanted to sell the laptop, I would copy it back no the disk to increase my chances of selling it for a reasonab (HowTos)