Microphone doesn't appear in the Device Manager in Windows 7

I'm using Windows 7 64 Bit OS on my MacBook Pro, clean installation, not based on Bootcamp, no MAC OS installed (required by our company otherwise I can't access corp network). Now my problem is that the speakers are working properly, but I can't use the internal microphone as it doesn't show up in the device manager. Cirrus  Logic CS4206A (AB28) latest driver is installed. External headset with microphone works fine. Any help welcome, thanks in advance.

I disabled my microphone in Bootcamp Win7 Ultimate 64B and now it is completly gone. I used the Windows support CD I made and re-installed the 64B Cirrius drivers but the microphone is no where to be found also missing in device manager as well as Control Panel Audio.
Help.

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