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?
Answer
I suspect which Windows 7 upgrade disk you use is irrelevant. The only thing that should matter is that the Windows Vista version matches the license key version. For instance, if you have Windows Vista Home for one PC, and Windows Vista Starter for the other, then the license keys won't work for each other.
Check the COA/license key on the back/bottom/side of each computer, and make sure it matches. If you can't tell, then I suggest trying to install Windows Vista (and then upgrading to Windows 7) before you sell the computer. If it doesn't work, you've got the wrong disk, so try again.
You are, of course, planning to re-format the drive before selling your computer, like any responsible computer user would, right?
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