upgrading to php 4.3.11 gets me "No input file specified"

Having some problems upgrading php 4.3.10 to 4.3.11, any advice on what to check or what my problem might be? test script: info.php "<?php phpinfo(); ?>" OS: Win2000 Server: Website 3.5 Server API: isapi php folder C:\php path includes c:\php PHPRC = c:\php C:\WINNT doesn't have any files with php in their name. searched c:\ for "php4ts.dll", only showed up in the c:\php and php-4.3.10 folder. installed 4.3.11 by renamed c:\php to php-4.3.10 unzipped the 4.3.11 binary zip file for windows renamed the 4.3.11 folder to c:\php copied php-4.3.10\php.ini to c:\php restarted WebSite opened up http://server/info.php -> "No input file specified" switched back to 4.3.10 by renamed c:\php to php-4.3.11 renamed php-4.3.10 c:\php restarted WebSite opened up http://server/info.php -> normal info