Check with your computer’s manufacturer and make sure you are running the most up to date version of the SigmaTel drivers. You should be able to download the newest version from your computer or motherboard manufacturer directly. If the most recent ones still do not work, uninstalling and reinstalling the existing drivers then disconnecting, uninstalling and reinstalling the camera might fix the problem.
If you have a control panel in your computer settings called Sigma Tel, please check that it is set to “allow reconfiguration pop-ups”. You can then try disconnecting the camera and uninstalling/reinstalling that; if the sound card is struggling with anything it should pop up a window asking you to confirm how the microphone is connected.
Finally you can try going to Control Panel, then System, then Hardware, then Device Manager. Under the Sound category please right click and uninstall any sound card drivers then restart your computer. Windows should automatically reinstall the drivers or you can go through your computer manufacturer’s website to get the latest versions.
For further support with this issue please speak to your computer manufacturer.