|I don't know that that's anything to worry about. CTFMON.EXE runs in the background when Office is running:|
When shutting down, some things may be closing slower than you'd want causing the message to pop up. I get that sometimes with some AOL-related programs. You might run MSCONFIG and check the 'startup' tab and see if you've got stuff running in the background you don't need. I assume the message pops up for a few seconds and then windows goes ahead and shuts off?
But if it's preventing a shutdown--and depending on what the Explorer message means--then something else must be going on.