I sound like a meanie when I say this but I'm not trying to be...
Have you checked your programs to make sure they have the mic enabled?
Vent has an input/output option area in the setup, skype and the like do too I'm sure.
Other than that, return if you can and good luck.
Check in your sound preferences to make sure your default recording device is set to whatever port you have your mic plugged into. For example, my computer has 3 mic jacks and can also use the mic built into my webcam. The webcam likes to try and override the other mic ports - which screws with things sometimes.