install php 4.2.0 with apache 1.3.2x on winXP

for upgrade purpose, i try to install php 4.2.0 CGI windows version; unfortunately, i encountered an error that apache cannot load module called php_pdf.dll from path c:\apache\php\extension when i run any php script file i checked the php.ini file, found that the path of extension directory is the same as i installed php 4.0.6, meanwhile, httpd.conf file is remain unchanged when php binary installer performs typical installation, so i forced to rollback to old php CGI interpreter in order to continue the development tasks how can i load the php_pdf runtime module without such error? My computer software configuration: apache 1.3.23 php 4.0.6 with pdf function enabled mysql 3.23.40