The problem is likely the result of unregistered DLLs associated with the ms-its protocol. People with this problem are likely running XP SP2 and are also unable to open some windows help files. (E.g., c:\windows\system32\windows.chm.) I was able to fix the problem by running this windows help diagnostic utility which registers the necessary DLLs: http://helpware.net/downloads/MJsDiag.zip.Let us all know if this works for you.BarryOttawa, Ontario