Sometimes you accidentally deleted the sound card driver, when you see the sound icon in the lower right corner has marked with cross, if you click the icon it will automatically update the driver for you and then it prompts installed successfully, but when you open the audio are found no sound,  shown as below:

In this case, it was the system comes with software did not match the sound device and resulted in an unsuccessful drive. So you need to update with the compatible driver. To update your sound driver in Windows 7, please follow the steps below: Read the rest of this post »

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