I have a 722US and only had the problem with the sound when the volume was at full. I dont know if we have the same sound card or not, but that could be part of the problem. Try backing off your voulme a little bit. Secondly, about the video driver, mine worked right off from boot. My advice there is to try and reconfigure your driver either by reinstalling, or you can do it in the GUI, but I cant remember how.
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