When HD 2300 webcam is connected via USB (PC is HP Pavilion 500 running Windows 7) - my external PC speakers only make a loud buzzing noise, music won't play on speakers (MP3 music files via Windows Media Player). Music plays OK when webcam is disconnected. Called HP support, they temporarily "fixed" this via remote control but webcam wouldn't come on. When rebooted the PC, webcam came on and the problem returned. Any suggestions appreciated.