upgraded apache won't start

Hi; I upgraded to Apache 2.2.6 and it ran fine when I tested it after configuring the httpd.conf file (although instead of getting the PHP configuration page I got a page that said simply "It works.") After I rebooted though, I can't get it to run. The error log refers to a syntax error in the following line in the apache conf/httpd.conf file. LoadModule php5_module c:/php5/php5apache2.dll It says the specified module can't be found. The module certainly is there and it worked with apache 2 before the upgrade. What am I missing here ? Thanks; Pat