firstly do one thing go on Google and search your o/s which u want to install or which opreting system key u have..............and then u download it and make a image in ur CD or DVD and try it before deleting your downloaded o/s file. if they work then u enjoy and leave Ur worry because now u have that which u want. but remember don't sold it in market because u have pirated CD or DVD. because it a offense.
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