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 ...

The Software Licensing Service determined that the specified Key Management Service (KMS) cannot be used. What causes Windows Activation Error 0xC004F015? There can ...

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 ...