I've had this happen on two occasions running a PIII and Win2k. One time it was a title on a URL stored in favorites on IE 5.5, the other time or two it was caused by clean manager trying to find old files to compress. And of course, I didn't correlate the two problems until well after I initiated the actions that caused them. The problem was solved by shortening the title of the URL ...it was ungodly long ...some musical instrument store with every conceivable instrument known to mankind in the title and secondly, to remove the registry entry that involved sageset getting hung up on finding old files to compress.
Does this occur on startup before starting anything up?