Windows Media Player often gets disconnected to its plug-ins. In these cases, you have to enable the TuneUp plug-in again in Windows Media Player.
-In WMP11 or below, you can do this by clicking the View menu item, then select Plug-ins -> Other -> TuneUp
-If you are using WMP12, please right click on the top bar of the player, next to where the word Library is and that will bring up the menu where you can find the Tools. The plug-in option is found in Tools -> PlugIns -> TuneUp