I was pretty sure that the product key was just fine, and for some reason, Windows could not recognize it. While it resolved for me quickly, here is the list of things to try. Restart Windows PC Check ...

Windows Activation Error 0x80070520 is one of the many Activation errors users encounter while switching to a new laptop or PC or upgrading to a newer version of ...

I did a search and didn't find any results concerning this problem. I've just built a new system and my Windows 7 disc won't boot, so I'm installing Windows XP so I can then install Windows 7 on top ...