Birds in a forrest sound after running CCleaner

With my head phones on, I can hear the faint sounds of various bird calls through the head phones that is very similar to what you might hear in a forrest. It might be related to CCleaner since I hear a bird tweek-tweet when I first run CCleaner. The bird sounds continue even after CCleaner stops. Muting the computer speakers makes the bird sounds go away.

The bird call sounds are pleasant (somewhat like the bird sounds in http://www.youtube.com/watch?v=PdJa3KcTQXk ), but I'm not sure what is causing them. Any ideas? Is there some sort of bird call background noise program/virus that could cause this? I checked my installed programs and none of them would seem to cause this.

 

The sounds really do sound like they come from a bird, like in the above video, but not as loud and without the background noise. (I found the above video after starting this thread to give you an idea of what I am hearing so that you do not think it is coming from my harddrive).