Here's complete info from the Command Line in Task Manager:
rundll32.exe C:\Windows\system32\inetcpl.cpl,ClearMyTracksByProcess 10554
There are 2 of those running, taking up 150K to 900k memory & 5 - 30% CPU. I end them, and everything's fine. After a few days, they return.
They seem to run after I use something with Audio &/or Video, e.g., Zune, iTunes, GoToMeeting, Pandora, but I can't pin it down to any one application. I say "seems" because maybe it's not related at all.