PHP on WinXP with IIS - CGI Error

I am trying to install PHP on Windows XP with IIS. I downloaded php-4.3.1-installer.exe and ran it selecting the standard installation option. Then I used the Internet Information Services applet in Control Panel to create a Virtual Directory within my Default Web Site named PHPWeb. The local path for this Virtual Directory is c:\PHPWeb. I created a very simple test file containing: <HTML> <HEAD> <TITLE>Test PHP Script</TITLE> </HEAD> <BODY> <?PHP print ("<CENTER>hello world!</center>\n"); ?> </BODY> </HTML> When I try to load this page in MSIE6 (with the latest Service Pack) I get the following error: CGI Error The specified CGI application misbehaved by not returning a complete set of HTTP headers. The headers it did return are: nothing else is shown on the page! Do you have any idea what I've done wrong or failed to setup or configure? The installation directory is C:\PHP. In attempting to trouble shoot this problem, I've copied php4ts.dll into C:\Windows\System32 and I've edited my php.ini file setting to set extension_dir = c:\PHP\ I've also tried extension_dir = c:/php/ Any ideas? Thanks, ron@gordonfamily.com