[PHP-INSTALL] Premature end to script headers

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Using Apache, OS of Windows XP Professional
I edited the httpd.conf file and added these lines to the end of it:

ScriptAlias /php/ "c:/php/"
AddType application/x-httpd-php .php
Action application/x-httpd-php "/php/php.exe"

Then I created a text file called "phpinfo.php" and put it in the
DocumentRoot directory (in my case, C:\My Website) with the following line
of code:

<? phpinfo(); ?>

and then tried to access it at http://localhost/phpinfo.php
Except I get an Internal Server Error.

In the error log: [error] [client 127.0.0.1] Premature end of script
headers: php.exe