Hey guys,

I received an error indicating that my product key is not valid when installing Windows 8 Ultimate. I do not know why this happened. I'm sure I typed the product key of Windows 8 Ultimate correctly . And I retyped it again. I got the same indication.

Any other reasons?

Many thanks!

Hi,

You might be using a product key that doesn't match Windows 8 ultimate that's installed on your computer. Check the product key to make sure it is for the version that you are trying to activate.