Updating product key on windows xp
That licence is not freed up for use on another computer after the upgrade.From the Windows 8 EULA (source: ZDNet): The software covered by this agreement is an upgrade to your existing operating system software, so the upgrade replaces the original software that you are upgrading.To the best of my knowledge, nothing special happens to your old product key. If you restore your old pre-activated Windows 7 install, then that essentially deactivates your upgrade key and frees it up for use on another computer, if you so desire.Bottom line is, as long as you're using a Windows install activated with the upgrade key, you're not allowed to use a different Windows install activated with your old key. On a somewhat related note, if your Windows 7 licence came with your laptop (in other words, it's an OEM licence), then you're not even allowed to use it on your desktop - OEM licences are permanently tied to the hardware (specifically, the motherboard) they were originally sold with or first activated on.You could if you wanted ( this is allowed by the license ) install Windows 7 over Windows 8 and install the Windows 8 upgrade on some other computer. Its only the OEM licenses that cannot be moved around.
This will erase everything that was on the partition and install Windows 8 (or 8.1 for that matter) instead.
But in some ways it's a very specific answer, and doesn't cover the general case.
When you use an upgrade version of Windows, you need to have a valid licence for a previous, eligible version of Windows.
It used to be a skill that only “tech-savvy geeks” had in their arsenal, but nowadays it is surprisingly simple to do.
If you’ve done this sort of thing before and just want to get the version-specific information about Windows 8 then feel free to skip ahead; otherwise, you might want to read the introductory steps carefully.