|I had the same problem - I even checked the noise with total recorder - the buzzing was registering in the audio output...in stereo, I should add.|
anyway, I checked through the task manager, and found a few processes running that started with 'sym'. I checked them, and the only return I got was potential infections on norton. Some sites say norton was infected, other sites say the processes are required...all I know is that I uninstalled norton, rebooted, and the fly is dead.
my theory is this: since the infected file(s) were IN the norton folder, the scan didn't pick them up. I can't confirm that, though...is Norton that egotistical? Maybe.
I'll be using AVG from now on.