I want to use external speakers and USB headphones...

Question

My PC audio used to be real simple. I would insert the USB cable to my Plantronics GameCom Pro 1 headset and sound would go through the headset. When I removed the USB connector, the external speakers would play sound.For some reason now, I have to go into Sounds and Audio Device Properties and specifically choose the Default Playback device. I would like to get back to the way my PC used to work.My audio is C-Media AC97 onboard my motherboard.What do I need to do to get back to the way the PC used to work?sound card drivers required