How to download and reinstall my preloaded windows 8 on inspiron 2350 all in one

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How to download and reinstall my preloaded windows 8 on inspiron 2350 all in one

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Hi I have a new Inspiron 2350 All in One pc which has come preloaded with windows 8 Single. I need to use this machine on my network at work and therefore want to do a clean install of Windows 8.1 Professional x64 But before I do that, I would like to know how I can retrieve the original installation software that came preinstalled on my machine, just incase I have a problem with windows 8.1 pro and need to revert back to the preloaded software ie. windows 8 Single. Also, how can I retrieve the activation code for my preloaded software Windows 8 Single. any help will be much appreciated. Thanks
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