I believe what your asking for is in the httpd.conf file and edit the area I've shown
as follows. The key in the options it I believe not to have indexing in there.
# This may also be "None", "All", or any combination of "Indexes",
# "Includes", "FollowSymLinks", "ExecCGI", or "MultiViews".
#
# Note that "MultiViews" must be named *explicitly* --- "Options All"
# doesn't give it to you.
#
Options FollowSymLinks Includes ExecCGI
Although later you may have in httpd.conf this:
# Directives controlling the display of server-generated directory listings.
# FancyIndexing is whether you want fancy directory indexing or standard
#
IndexOptions FancyIndexing
Which is ok to leave
Hope this is of help
Maxit