How can I re-enable microphone?

I've an ASUS K42JP. I disabled the microphone device, and I have got the following message:

Your microphone device has been removed

How can I re-enabled the microphone? It is an internal one.

Solution 1:

Enable it in device manager (that is, assuming you're on Windows).

Click Start (windows icon) right click on my Computer and select manage.

From the window on the left, click device manager.

(Or: click Start button, write 'device' in the Search area, then select 'Device Manager')

Locate your microphone in the list, right click on it and enable.

EDIT

Another suggestion is

• Open the Sound window,
• Click on the Recording tab, and then right-click in the space under the last recording device and click "Show Disabled Devices."
• You should now be able to see the option to enable it again