>1) You are using an antivirus software that mess word automation, check readme1st.doc;
>2) Your machine is infected by a macro virus;
>3) Your office's instalation is corrupted.

4) Your normal.dot is corrupted. mskb#Q247028 INFO: Corrupt Normal.dot Causes Errors When Automating Word

Someone was just asking this same question on Compuserve....