Try using another player. The LW player tends to skip, pop, and generally mess up, and is really only good for previewing files.

Open LW and go to Tools>Options>Player, untick the box by "Use LimeWire Media Player" > Apply > OK. Your songs will now launch in your default player.

I use winamp but there are plenty of others out there. A good backup player is VLC media player, it has the codecs built in and will play most file types.

CODECs list for Movies/Alternate players / Video help forums/ video-mp3 fixers

How to set the Default applications

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