I registered and recieved a product key, good for 10 installs. I start the install and it gives me an error saying "Your product key cannot be validated. Review your product key and make sure that you have entered it correctly". I have tried several times, re-entering it, magnifying it to make sure that I have the correct letters and number and it won't validate. I tried it both ways, go online and get the latest updates and do not get the lastest updates updates, same thing. I did try what was suggested recently about installing the Windows Genuine Advantage Notifications.