Can't toggle microphone boost tab.

Hi there,

I have recently upgraded my XP to The RC due to laggy issues and I just love what the W7 OS can offer, speed and reliance. However, the thing is, that prior to installing the Window 7 OS, my mic was working perfect with microphone boost on.

Firstly, the mic didn't got recognised at all, so I thought, perhaps I was missing a driver and Yes...I was. So I got the Realtek driver and now I can detect voices in Skype testing call, but are extremely faint. Therefore I went to the option to increase the Microphone Boost, but it does not allow me to drag the slider to a higher value.

See the screenshot for detail.

Does anyone have suggestions? I have encounted with vista sort of like bug, and they mod the regedit... however I coudnt find any registry with the word "mic boost" in there so I gave up.

Any help is welcome.

Also my Audio Driver Version for the Realtek is

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