Live Messenger, jackin' with my sound levels

I use msn messenger on numerous computers in my house, but when I use it in the bedroom it always has some issue with the sound. It cause the audio to fade in and out. It will go from high, down to low, and then back to high. I thought it may have just been the video I was watching, so I ran over to YouTube, and had the same problem. I paused the video, turned off msn messenger, and went back to the video, and all was well.

Anybody know what the friggin' heck is going on with this P.O.S?