How can I know which key of Windows Vista corresponds to the upgrade key of Windows 7

Posted by js_ on Super User See other posts from Super User or by js_
Published on 2011-06-24T05:43:49Z Indexed on 2011/06/24 8:25 UTC
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I have two Dell PCs. And each PC has a Windows Vista disc and a Windows 7 upgrade disc which Dell gave me for free. And each disc has a product key. There are 4 product keys in total.

I'm going to sell one of the Dell PCs. But unfortunately I don't know which product key of Windows 7 corresponds to which product key of Windows Vista. If I sell the PC with wrong combination of a Windows Vista and a Windows 7, error will occur and I will get in trouble.

How can I know which Windows 7 corresponds to which Windows Vista?

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