Http://support.dell.com/support/downloads/driverslist.aspx?os=WW1&osl=EN&catid=3&impid=-1&servicetag=&SystemID=INS_PNT_PM_1525&hidos=WW1&hidlang=en&TabIndex=
Please try this and see if your problem is solved.
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What version of yahoo or google talk are you using?
Have you tried reinstalling the sound software and drivers?
Can you provide more details? Further, is it only when running chat apps, or at other times as well?
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