What should I do if the QQ voice function of the win7 computer cannot be used?

QQ, can be said to have become an indispensable tool in our lives, who does not have a QQ? I am afraid that only from the stars you? Not only in the life entertainment QQ, we can also use QQ in their work, now Many companies, presumably daily communication, including the transmission of documents will use QQ, then in the win7 system, if you find that your QQ voice can not be used, we know what to do?
1. The first step, we Need to check the sound card in the computer, the way to find the sound card device is very simple, just click to open the start menu, then enter the device manager in the search box and click Enter, this will appear the interface shown below, and The sound card is under the “Sound, Video and Game Controller” below.
2. If you do not confirm whether the sound card is intact, you can try to download the sound card of the corresponding computer model in the official website, and then reinstall the sound card.
3. If it is still not available, you may wish to click on the sound icon in the lower right corner of the computer to see if it is because it is muted. Right click on the small speaker icon, then select the recording device, select the microphone - attribute - level, then the interface shown below, we see if the microphone here is muted, if you mute, click the label Red icon, resume work can be done.