So I recently ran into an issue. My laptop is an Alienware m5500 and it has a built in mic. The issue with this is that I have an external mic that I need to use. Whenever I try to use Skype or Ventrilo it just picks up the sound from the Internal microphone not the one I have plugged into the jack. It does not do this however with a USB microphone because this creates a separate sound channel(I think that's what it's called). I'm looking for a way to separate the two microphone channels to external and internal or completely disable the internal. Any help would be greatly appreciated.

My laptop is an Alienware m5500 with Windows Vista 32 Bit and it has a built-in mic. The issue with this is that I have an external mic that I need to use. 

Whenever I try to use Skype or Ventrilo it just picks up the sound from the Internal microphone not the one I have plugged into the jack. 

It does not do this however with a USB microphone because this creates a separate sound channel  (I think that's what it's called). I'm looking for a way to separate the two microphone channels to external and internal or completely disable the internal.