I just ran into this as well (on WIN2K, SP4) and found that it seems to be related (in my case anyway) to the Microsoft Indexing Service. After I disable it it seems to have stopped the errors, tho I'm not sure if it has to do with stopping the service or taking it off of 'instant update'. Either way it wasn't doing what it was supposed to, which is index in the background when your computer is idle.
Try this for more: http://ask-leo.com/cidaemon.html
Good luck - thanks for the background footwork. Frustrating error.