Newbie problem: Php script not running in browser.

I have put the first php script to hello.php file: <html> <head> <title>PHP Test</title> </head> <body> <?php echo '<p>Hello World</p>'; ?> </body> </html> I am on xpsp3, wampserver 2.0, having apache 2.2.8, php 5.2.6, MySQL 5.0.51b http://localhost/ is E:\wamp\www I put the hello.php file to E:\wamp\www. drag/dropping it to browser shows the above source code in ff3/ie6 putting it to E:\wamp\bin\apache\apache2.2.8\htdocs and drag/dropping it to browser shows the same source code. However, putting it to E:\wamp\www\php_ex but giving http://localhost/hello.php shows a blank screen I have forgotten some situation where it had appeared as Hello World '; ?> on the browser. E:\wamp\bin\apache\apache2.2.8\conf\httpd.conf file has the lines: LoadModule php5_module "e:/wamp/bin/php/php5.2.6/php5apache2_2.dll" AddType application/x-httpd-php .php AddType application/x-httpd-php .php3 On double clicking the php file in windows explorer, it opens in notepad for edit, instead of getting opened in firefox that is my default. Please give me the starting push. -- V