I had this problem to some degree in sh3...you need to disable hardware accelleration for your onboard soundcard.
Im not sure where it is in vista so I can be of anymore help than that, you will just have to poke around till you find it.
Since you have a onboard soundcard you wont lose any quality ect by disabling it..and there doesnt seem to be much if any performance hit for disabling it...
give it a try, I think this should fix your problem
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