Enable Thumbnail Viewing but not Document Outline

When I create a PDF I want to be able to have a Thumbnail view in Windows Explorer but not have a Document outline. However I can't seem to enable one without the other.

In my Profile..
Under; Page View: I choose "Single page view"
Under; Document View: I choose "Thumbnail images visible"

However when the PDF is opened in Adobe Reader/Acrobat I also see a "Document outline" which I do not want.

How can I enable Thumbnail Viewing without enabling a Document Outline when rendered in Adobe Reader/Acrobat ?

Danke

Looking at this further, it seems to be problematic on one PC. Documents created with PDFCreator
don't have a thumbnail view in Windows Explorer while another PC does. The problematic PC has a mixed ability to view PDF thumbnail views. ???