Here is a list of the minimum Apache modules to have Drupal running (Drupal is PHP/MySQL application):

LoadModule access_module modules/mod_access.so (only with Apache prior to 2.1)
LoadModule authz_host_module modules/mod_authz_host.so (only with Apache 2.1 and later)
LoadModule dir_module modules/mod_dir.so
LoadModule log_config_module modules/mod_log_config.so
LoadModule log_rotate_module modules/mod_log_rotate/mod_log_rotate.dll (details on mod_log_rotate)
LoadModule mime_module modules/mod_mime.so
LoadModule rewrite_module modules/mod_rewrite.so
LoadModule setenvif_module modules/mod_setenvif.so
LoadModule php4_module "E:/apache2/bin/php4apache2.dll"

Additional useful modules

LoadModule deflate_module modules/mod_deflate.so