The Windows Activation system periodically checks for the validity of your key. If you have a genuine key and suddenly receive Windows Activation Error 0x800704cF ...

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 ...

When Microsoft first launched the Windows operating system, installing it was only a matter of copying the program onto a disk. You didn't have to verify your copy of Windows. Starting with Windows XP ...