I switching from HDs from the 3.5 HD OEM to a 2.5 SSD. I had recently installed WIN 7 a little over a month ago on the OEM HD with the product key that was re-emailed to me from Microsoft. I am now trying to use that same product key on the new SSD, but it says that my product key invalid. What do I need to do? I'm working on this now, help is very needed right now. Thanks.
The orginal OEM HD had vista on it, upgrade to WIN 7 a year ago, and then the reinstall a month ago with product key that was re-emailed to me.