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Rasping sounds in speakers

After I installed Wireless Entertainment Desktop 7000 (Bluetooth) the sound from the speakers is rasping whenever I type or moving the mouse. I have the lates Vista drivers booth for my soundcard (SigmaTel, 7.1) and for the Wireless Entertainment Desktop 7000. I can't find out what the problems is, or can it be so that it's the bluetooth that is cause this?
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