Hi MahMoh,
Method 1
I would suggest you to try the steps from the following link and see if that help.
No sound in Windows
http://windows.microsoft.com/en-us/windows/help/no-sound-in-windows
Tips for fixing common sound problems
http://windows.microsoft.com/en-US/windows7/Tips-for-fixing-common-sound-problems
Method 2
I would suggest you to check in for the microphone under playback devices.
Method 1
I would suggest you to try the steps from the following link and see if that help.
No sound in Windows
http://windows.microsoft.com/en-us/windows/help/no-sound-in-windows
Tips for fixing common sound problems
http://windows.microsoft.com/en-US/windows7/Tips-for-fixing-common-sound-problems
Method 2
I would suggest you to check in for the microphone under playback devices.
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a.Click Start, type Sound in the Start Search box.
b.Click Sound in the search results at the top of the Start menu.
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c.Click the Playback tab. Notice the check mark next to the default device. For most users, the default device is Speakers. Make sure that your audio settings are configured as expected. Follow these steps:
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d.On the Playback tab, select the playback device, click Properties, click the Advanced tab, and make sure that the Default Format is set to the value that you expect. When you finish, close this window to return to the previous window.
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e.On the Playback tab, select the playback device, click Configure, and then make sure the configurations are set correctly.
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f.Select the sound device that you want as the default sound device, and then click Set Default.
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g.Click OK to save your settings and to close the Sound dialog box.