DFX is an audio enhancer developed by FXsound that boosts the sound quality of all songs, music, videos, Internet radios, games, and other programs. It is compatible with all major audio and video players including Musicmatch, iTunes, Spotify, Windows Media Player, Winamp, VirtualDJ, VLC media player, Media Player Classic, QuickTime Player, RealPlayer, Rhapsody Software, JetAudio, GOM Player, MediaMonkey, DivX Player, foobar2000, KMPlayer, Songbird, BS.Player, JRiver Media Center, and Pandora One. If you have issues, I suggest you remove it from your computer and then install it again following the instructions from the official web page. Also, if you want, you can upgrade it to the latest version. If the problem persists, you will need to contact the Support team.