A friend of mine asked me tonight how to deal with a computer he bought that didn’t have a CD key sticker (it was second hand.)
I found this page: http://www.howtogeek.com/206329/how-to-find-your-lost-windows-or-office-product-keys/
And I tried the Nirsoft http://www.nirsoft.net/utils/product_cd_key_viewer.html#DownloadLinks ProduKey software.
I may have used this in the past. But it was a quick download. And it works very well.
It sounds like he wants to wipe and re-install on the netbook type laptop computer to be safe – in case the seller left anything bad in Windows 7.
Alan Spicer Marine Telecom
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communications @ marinetelecom.net