Avast mute (turn off) microphone on my headset

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Hi all,

i have problem with avast, i think 2 version avast back, when i update version of avast it mute my microphone (microsoft lifechat lx-3000) headset, microphone dont react, in windows soud option i see bar it dont go volume of microphone up and down when i speak. But hear sound in heasset work fine. I think its software problem but i am beginner in this .
It help unistall avast and install again, today it do again - mute.

Win 7

Thanks for any advices.

[Asyn]

- Which Avast..? (Free/Pro/IS/Premier)
- Which version..?
- OS..? (32/64 Bit..? - which SP/Build..?)
- Other security related software installed..?
- Which AV(s) did you use before Avast..?

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Win 7  SP1
64bit
Avast free, i only use avast no other antivirust used before
whis version of avast was problem with dont remember only it was 2, 3 weeks back, and today ( maybe becouse automatic update )

[Asyn]

1. Download Avast Free Antivirus: https://files.avast.com/iavs9x/avast_free_antivirus_setup_offline.exe
2. Follow instructions: https://www.avast.com/uninstall-utility (Run this tool for all prior installed Avast versions..!!)
3. Reinstall Avast with the downloaded installer from point 1.
4. Reboot.