Unable to Establish a Connection

If you’re sure that you have a valid Internet connection, yet you are receiving the above error message, your system clock may be incorrectly set, which causes the connection between your computer and the activation server to fail. You get error message : “Unable to establish a connection with the activation server. Please check your network settings and confirm that you are able to connect to the Internet, then try again.”

This solution, Double-click the time in your System Tray at the bottom right corner of your screen. Set your calendar and clock to the correct date and time, click OK, and try the activation again.