Your problem is for either of 2 reasons. 1. You're not pressing the Apply button when you make your changes within LW. Untick LW's media player. (Perhaps you do need to wait until LW re-opens I'm not sure.) 2. You haven't set your default player correctly. For each particular type of file, select it on your desktop or wherever (but not within LW), & go to File>Properties & Open with ... & select your app. to open it with. eg: For AVI you might select VLC to play it, but for WMV & mpeg you might select WMP, etc. Same applies for music. There's many types of mp3's. You might want some to open with WMP but some others to open with QCD (Quintessential Player: a free player with built-in codecs that plays all mp3 types)