Hearing Random "Mouse Clicks"/"Enter"keypress as Windows System Events

XP Home + SP2

After installing SP2, I have been hearing Clicks coming from my speakers
similar to the left mouse click or hitting the Enter button when MSIE is
running.

I am away from the PC, not touching either the keyboard or mouse.

Today I was listening to Winamp and the clicking was driving me crazy.

Any ideas where to look for this?

TIA - Wayne
aka Bubba6 keyword 6191