Microphone on nforce2

[offnorris]

I recently got a "Clone" microphone and i'm having problems with the sound coming out of it. It's an annoying buzz or something like this: http://media.putfile.com/Mic-prob

Here a screenshot of the config panel:

When i mark "Aumento the sensibilidade do microfone" (Microphone boost) or when i unmark "Sem Audio" (No Sound) the buzz gets too much high when i start talking in any software. I also can hear the buzz on the headphone when the "Microphone sound" is unmarked.
But if i don't boost it the sound apears to be too low that nobody can hear me.

Well I have an Abit An7 Guru with onboard sound and i'm using the nForce_5.10_WinXP2K_WHQL_english driver for windows XP. If you need any more information to help me just ask. Tkz!