Installation problem - Help Appreciated

HI I am new to PHP-GTK but not new to php, looking forward to getting started with the package but i am having a few installation problems. running win XP and have an existing PHP5 & Apache installation Followed the instructions on http://www.sitepoint.com/article/platform-windowed-apps-php but get the following error when i try and run the hello.php example. Warning: Unkown(): (null); Unable to initialize module Module compiled with module API=20041030, debug=0, thread-safety=1 PHP Compiled with with module API=20020429, debug=0, thread-safety=1 These options need to match Any help on how i can fix this would be most appreciated Thanks Ade