Trouble setting up

Hello all I new to the php . I was wondering if anyone could help me out with a little problem that I'm having. I download the new version of php. I installed mysql , apache (new version) and php. What i'm having trouble is setting it up. I found a link how to set up php, mysql and apache. I everthing on the page, but when it comes down to editing the httpd.conf file I get lost. I added the two things it tells me to do. 17. Edit your httpd.conf or srm.conf file and add: For PHP 3: AddType application/x-httpd-php3 .php3 For PHP 4: AddType application/x-httpd-php .php I then stop the apache server and restart it. I have a folder that has php file . when i try to bring this up i get this error message. "The page cannot be displayed. " I checked the folder and the permissions . everything looks fine. so can someone tell me what i'm doing wrong. Thank you ..... Luis