DZLDOC59, That "ShellconHiddenWindow" message appears to be associated with the Musicmatch Program. Go thru the thread at the link below where you'll find a possible solution.
More possibilities at the links at the search link below.
This started popping up when ever I shut my puter off.Doesn't show up as a virus,ad ware,spyware or running program on task manager.Nothing shows up on file and folder search. I'm running winXP sp2.Any one have a clue or heard of this before?
Thanx for any info.