You might have never entered a Windows or Office product key before in your life. If you did buy a preinstalled version of Windows for example it could already be activated by the default. The product key can be usually found on the Recovery CD that comes with the purchase of the hardware, on the hardware itself or on a booklet.
You do need the product key if you want to reinstall the operating system for instance. You could start searching for the product key or you could simply use the software Produkey to find out and display the product key of the Windows operating system, Microsoft Office, SQL Server, Exchange Server and several other Microsoft applications.
It is possible to export all product keys in a html file which can then be printed to have the product key available when you reinstall the product again. Copying does not work when installing the operating system, this means that exporting and printing is probably the better solution.

What I like is that you do not have to install the software at all – as usual with Nirsoft applications.
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Your software is so cool.
There’s also a software that does this at http://www.password-genius.com/how-to/how-to-recover-my-windows-xp-product-key.html. The advantage is that it can even find out your Windows system CD Key when your Windows can’t startup.Also, This software will find many other keys like office XP, office 2007 and more .