I use KM Player to play all my music and video. The KM Player plays every format under the sun and every functionality I can think of for audio and video and the quality is execellent. An added bonus of the KM Player is that it is compatible with plugins made for Winamp. For eg I currently have Graphical and Parametric EQ plugins running in real time for bass management / subwoofer intergration. You can find a plugin for almost anything too.
If you have Vista, then it's literally plug and forget regards to the 7520. Vista does everything automatically.
