Microphone Boost in Windows 8

Right click on speaker icon, then choose Recording devices :

Double click on Microphone or choose properties instead as shown below :

Go to level Tab :

Change the Microphone Boost and Microphone volume as shown below :

Doneee.... :D
Ummm.... Btw we can change the default device for this microphone, just go to Listen Tab then change your default device to another be available devices, for me it's high definition audio device :

Vidio :