Norton Office Plug-in

I have a user that is having problems with MS Word.  When she opens a document the application freezes.  The windows error report states that the problem is being caused by Norton Antivirus Office Plug-in.  Norton is not installed on the pc at all and as far as I know never was.  I have performed a search for the officeav.dll file but it is not found on the system.  Anyone have any ideas on how to fix this?