My microphone is not working at all

I have a pair of headphone from Genius and my microphone is not working. I don't have a driver for it but I have installed my audio soundcard drivers, plugged in the headphones. I tested it through the wizard from Windows, went through the settings, boosted the microphone and yet nothing. Do you have any ideas why my microphone is not working or what should I do? Any help would be appreciated. I tried on Skype and Yahoo Messenger but the same result. People can not hear me.
