Messenger voice problem

>-----Original Message-----
>I can not get the voice in MSN messenger to work on this
>pc. I have two other pcs that it works fine on. This one
>has winXP Pro, the others have Win2000. It has an Audigy
>2 ZS sound card with speaker and Mic connections in the
>front and rear. I use the front connections for Word
>dictation, and they work fine. I cannot get the Messenger
>tuning wizard to recognize the mic in the front
>connection. It sees it in the rear connection and sets up
>OK, but I can not send out any voice from it. When I try
>to send a voice message to a contact,the volume bar moves
>as it should, but no voice goes out. Same problem with
>the phone thru messenger with net2phone. This pc and one
>other are hard wire connected to a router, the third pc
>is connected to the same router wirelessly. The other
>two, one wired and the other wireless, communicate fine.
>I can receive voice on this one, but cannot send out
>voice. I have the same problem if I try dial-up. Any
>suggestions will be greatly appreciated; I have tried
>everything I can think of. Thank You.
>.
>