Tools > Folder Options... > View tab > Always show icons, never thumbnails.
Forum Moderator and Customer Courage is resistance to fear, mastery of fear, not absence of fear - Mark Twain He who feared he would not succeed sat still
If you change the folder default view to details or list I believe that does it. You can do it on a per folder basis but then you would need to delete the thumb.db file afterwards as I believe the Windows default is to use thumbnails whenever the folder contains pictures
