Page not found

Hello, I have installed both Apache and PHP on my computer in the following directories: d:\program files\apache group\apache d:\documents and settings\administrator\desktop\mydir\yo\php4 I then edited d:\program files\apache group\apache\conf\httpd.conf as per the instructions listed on: http://hotwired.lycos.com/webmonkey/00/44/index4a_page9.html?tw=programming However, as soon as I tried to access the file http://localhost/phpinfo.php, I saw a page not found error. I tested by viewing the other files in the htdocs document root directory such as http://localhost/index.html.ca and was able to see them okay. So yes my Apache server is running and I double check on the httpd.conf file's setting but didn't find anything wrong. Any ideas? Thanks