grey question marks and no volume

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May 6, 2011
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hi, my volume is all the way up but underneath, there is a circle with a line through it and there is no sound. also there are 4 grey question marks in my tool bar for microsoft messenger, VLC, microsoft project gallery, and microsoft document connection, and my dvd player has an error message that a valid video device could not be found for playback. this all happened within the last couple of days and at the same time. i have had a recent software update. could this be the problem? any suggestions?
 

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