Im using win xp pro and am having no probs whatsoever with apache 2 (go on, be daring...). Anyway, as far as I can see it, there are four lines that you have in:
The load module one: LoadModule php4_modulec:/php/php4apache.dll
The addmodule one: AddModule mod_php4.c (this one REALLY confused me, cos i cant find that file ANYWHERE on my computer
AddType application/x-httpd-php .php
Action application/x-httpd-php "/php/php.exe"
(number 4 is where the php.exe file is from your root directory)