New
#1
Identifying the correct product key
I'm about to upgrade my computer for the first time since Windows 10 came out, and it is a substantial upgrade (including the motherboard.) I have four computers in the house running Windows 10. Two of them use upgrade licenses from Windows 7, two have retail copies purchased from Amazon. My Amazon account has three keys: my two, plus one I purchased on behalf of a friend when I was setting up his new system.
I need to find out which product key is associated with this computer. It could be any of the three listed on my Amazon account (one of which is not actually mine), or (potentially) it could be one of the upgrade licenses and I'd need to buy a new copy of Windows with my upgrade.
How in the world do I figure out which one is on one specific PC?