I have a laptop I purchased about a year and half ago that came loaded with Windows 8. I upgraded to 8.1 and to Windows 10.
The laptop crashed, I had to reload Windows 7 as I didn't have the Windows 8 disc the laptop came with. I attempted to use the Windows upgrade tool to get back to 8 or 8.1 and now it's says the Product Key is not valid. Is it not valid because
it was used to upgrade previously?? Even more strange, it doesn't accept the Windows 7 Ultimate Product Key either and the software was a Microsoft Company Store Purchase.