I see that you've got Realsched.exe in there.
One of my sons had horrendous problems with something related to realshced stealing processor cycles. Not saying that's your current problem, but is it possible that there's something lurking in the realsched area that's kicking off each time you boot up?
As far as I can make out, you won't do anything awful to your PC if you disable realsched (rename or move it). It's something to do with scheduling tasks in Real Networks applications.
ST