Learn how to turn on disabled sound devices in Micosoft Windows Vista Operating System in the Sound Control Panel Program, so you can use the devices like microphones, line-in jacks, speakers, etc again.
Click the link to read my tutorial on enabling disabled playback and recording sound devices.
1. Go to Control Panel, and press the sound icon.
sound
2. Pick the Playback or Recording tab. Right click on the recording device window , and check “show Disable Devices” and “Show disconnected devices”.
Show
 3. Right click on the disabled microphone and pick enable.
enable