"Ron" escreveu na mensagem ...

If a laptop came with W8 and was upgraded to W8.1 can it be refreshed
using this media?

....

"After you've created the installation media, do one of the following to
install Windows 8.1:

•Connect the USB flash drive to the PC where you want to install Windows
8.1, browse to it in File Explorer, and then open the setup.exe file. Follow
the instructions in setup.


•If your PC is set up to boot from a USB drive, connect the USB flash drive
to the PC where you want to install Windows 8.1, restart (reboot) it, and
then follow the instructions in setup.


•If your PC is set up boot from the DVD drive, insert the DVD into your PC,
restart (reboot) it, and then follow the instructions in setup."


http://windows.microsoft.com/en-us/w...-refresh-media


If so do you have to have a key for it?

....

"If you’re not running Windows 8 or Windows 8.1, you’ll need to enter a
Windows 8 or Windows 8.1 product key. You'll also need a product key if
you're running Windows 8 and trying to install Windows 8.1 Pro. To learn how
to buy Windows 8.1 to get a product key, go to the Get Windows page."