Mute Unmute microphone not working in windows 8

Hi,
I am working on video streaming application for Windows 8 and facing some problem when trying to mute microphone and unmute microphone.
I am trying to mute the microphone with changing the mic.gain value to 0 and unmuting the same by changing the gain value with its default value i.e. 50, but its not audible when unmuting. and after unmuting when tried with opening the flash player settings panel and doing little change in echo settings there then it starts working fine. So each time I have to do changes in settings panel after unmute. activity level in that case also goes to 0. Please help with the problem.
Thanks
Nitesh Kumar

Hi,
Please run the following tool to re-install the software:
   http://ftp.hp.com/pub/softlib/software12/COL50403/mp-122330-1/hppiw.exe
Regards.
BH
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