It seems to me like a problem with the sound card drivers. What sound card is it? I don't think you can overclock a soundcard because I don't believe it has a processor in it, but even if you could, and you did, it would just speed up the clockcycles of the processor, it wouldn't make it play any faster.
Right click on My Computer and go to Properties. Get into the Device Manager, and let us know everything listed under Sound, video and game controllers. And whether anything has a little yellow exclamation mark or question mark next to it.
cscgal
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