Music skipping

when i play my music and im browsing the web or running a program in the background or even if im not the music will often skip or get leggy anyone else had the problem

System specs

AMD athalon x2 dual core 4600 (2.4 GHZ)
4gb of ram
Nvidia Geforce 8600 (512 mb) LE
realtek hi definition audio

Please respond soon thanks :D

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