I have an Inspiron 20 model 3043 with Windows 8.1 purchased new from Amazon 9/14. I would like to re-install the operating system back to factory default, but this computer does not seem to give me an option of using F8 to re-install the OS like on my other Dell computers. So, I downloaded 8.1 from the Microsoft site onto a flash drive since there was not a DVD with the OS included with the computer. It asks for a Product Key which was also not supplied with the computer (or was it on the carton that I threw away?). How do I re-install the OS. Thanks
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