Getting Error after Install

Actually it installs fine, but after I remove install directory and tell it to install prillian i get:
The requested URL /home/nnzmcom/public_html/prill_install/im_install.php was not found on this server.
the path is correct I dont know why its saying its not there it is, do I need this?
The requested URL /home/nnzmcom/public_html/prill_install/im_install.php was not found on this server.
the path is correct I dont know why its saying its not there it is, do I need this?