I did think it might be my headphones. They are fairly old, but the thing that made me think otherwise was that the sounds weren't instant. They started after a awhile. When it happend with 1up yours i was listening with Firefox open, which is sucks a lot of resources. It happened with Crysis and MP2 which also probably suck a lot of resources.
Right now i'm listening to music at a pretty high volume and I don't hear it.
One thing I just did was go in and swap the plug for my front speaker port from the one labeled "HD Audio" to the AC' 97 one. Could that have been then problem?