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Microsoft has some resource pages about this. First, start by looking for the label as identified here: http://www.microsoft.com/howtotell/default.aspx.
From there, you can usually find a "genuine" validation program (WGA) that is specific to your operating system. As example, here's the page for Windows XP.
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I think you can find it out in their website....they have a place there to can click to find out......you can even see it in your computer properties
You can check you windows is original or not by using the link http://www.microsoft.com/GENUINE/ where you need to download a small files which check your windows is genuine or not
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