CGI trying to download

Hi,
I installed nagios and I can see the page on a browser, homewere when I click on service detail, tactical overview etc it try to download the cgi instead of showing it any suggetsions?
thanks !!!

You have to properly configure your apache.cfg and cgi.cfg in /etc/nagios:
nagios.sourceforge.net/docs/2_0/installweb.html
nagios.sourceforge.net/docs/1_0/configcgi.html

Or maybe the Apache itself:
httpd.apache.org/docs/1.3/howto/cgi.html