Last day when i started voice chat with my friend, my microphone stop working(he cant hear me).. i tried another headphone but it didnt work either, i thought its a driver problem so i uninstalled them, and then i tried to download realtek audio drivers, after installing drivers the audio still isnt working. I tried this 4 or 5 times but the prob is still there.

About 2 months ago it was the same prob but it solved by downloading codecs from cnet site but now it isnt working.
Please help my computer dont even sound BEEP for more than a day.
I have windows 7, 32-bit