Dell optiplex gx520 sound card driver

i have a dell optiplex gx520 i was able to use my headset to speak to people on skype but now its not working i am on windows 7 with a 32 bit system i was previously able to speak to people but now, the problem is that i can hear them but not able to speak to them its not picking up my mic i have changed the headset bought a new one today and same thing i have tried all ports for mic but its not working please help
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  1. Hi :)

    REINSTALL the sound drivers ...

    All the best Brett :)
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