How to add Media Center or upgrade to Windows 8 Pro in ASUS S400CA series:

1. Please go to the Control Panel and search for [Get more features in the new version of Windows].

2. Choose to purchase a new key online, or enter an already purchased key.

　3. Select the checkbox to accept the licensing terms, and then click [New Features].

4. The computer may need to be restarted to enable new feature settings.