Win 7 Sound issue

I just installed a new desktop ( see specs below). I'm having to use a wireless USB adapter from NetGear to connect to my router. My problem is when it receives packets, during downloads and a few other occasions I get a static/distortion through my speakers. It has the current drivers and I see no issues with the connections. Note: It plays CD's etc fine, even though you can make out the noise sometimes during. Thanks for any help.

System Specs:

AMD Athlon II X2 220
3GB Mem.
Win 7
Realtek Audio

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