How to add Media Center or upgrade to Windows 8 Pro in the ASUS S550CM series:

1. Please search for [Get more features of the new version of Windows] in the control panel (Figure 1).

　2. Choose to purchase a new key online, or enter an existing key Purchased key (Figure 2).

　3. Select the checkbox to accept the licensing terms, and then click [NEW FEATURES].

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