Audio A/V controls grayed out - no audio

Hello,
I am on a PC running Windows XP. I have purchased Quicktime PRO and the MPEG plugin.
MY Question is: My Audio A/V controls are grayed out. When I go to Window->Show A/V Controls my Audio A/V controls are completely grayed out. No audio.
However, audio is fine on my PC running numerous applications?
Any ideas,
Gary Young

Thanks for responding, no there is no sound from the headphone jack either. It seems like the problem started with the last update installation. A couple of weeks before that I had changed out the memory for a 1g in the upper slot. Everything else working well and memory seems to be happy. Those are the only two things I can think of that have gone on with the system. Internal speakers show up as the choices in sys pref and it switches back and forth from internal to headphone promptly when you insert/remove plug. The tex instr sound card is showing up in the hardware description in about this mac. Most of this detail may be meaningless, but figured there might be a clue in there for someone more clued up than I am.
Thanks

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