You haven't really provided us with any real meaningful information about your setup, other than to tell us that you use a webserver software that we do not support. You haven't even told us what version of osT your running.Do you have cgi.fix_pathinfo enabled in your php.ini? as indicated at Admin panel -> Dashboard -> InformationPlease help us to help you by reading and following the posting
guidelines located in this thread: Please read before requesting assistance. The more information you give us the better we will be able to assist you. Thank you.