It's a known problem for 6.0. If you or your father upgraded to MSN 6.0 recently, you could have the problem. There seems to be no single solution but a number of things you can check. Do a search on Google like "MSN Messenger 6.0 audio", you will see that problem has been discussed quite a bit. Try follow those leads.
MSN Messenger 6.0?
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谢谢高人!!
-dusen01-
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10/23/2003 postreply
17:52:00
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但是我和其他新下载 6.0的朋友可以通话
-dusen01-
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10/23/2003 postreply
18:05:00
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结论:选用老版本MSN!
-dusen01-
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10/23/2003 postreply
18:15:00