As I remember, I only added these lines in the httpd.conf file:
LoadModule php4_module c:/php/sapi/php4apache2.dll
AddType application/x-httpd-php .php
Make sure, you copied all files (dlls/*.dll, php4ts.dll from you php directory) to winnt\system32.
Since I upgraded my apache to version 2.0.39 (don't do this!), I have no older installation files of my apache 2.0.36 anymore. /cPH 🙂