Microphone volume is too low

I re-installed my windows 7 - 32 bits on my Asus K52F 64 bits computer.
Everything works well except my microphone,

During skype conversation my voice volume is very low.

*I installed the drivers and it works well.
*The boost level and volume is on maximum.
*i tried everything in Control panel-Sound.
*its says "This device is working properly."
*the driver is - Conexant CS20671 smartaudioHD and it is the latest in asus drivers website.

Please help me,

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