Hi every body

I am a PHP developer with 10years exp. in development.
when I open the url "http://localhost/index.php" the website appear without any problem..
but when I add "/" to the URL "http://localhost/index.php/" the website appear without image ..

what is the problem ? and how can I solve it..

also
I am using iis with PHP
1- what is the setting to make iis top secure ?
2- what is the setting to make session & PHP secure ?


I will be very thanks for any help