Hi,
perhaps this will help:
OLD: (apache 1.3.24) LoadModule php4_module C:/Programme/PHP420/sapi/php4apache.dll
NEW: (apache 2.0.35) LoadModule php4_module C:/Programme/PHP420/experimental/apache2filter.dll
good luck
If it can help, I tried to make an installation doc of PHP4+Apache2 at: http://137.194.8.83/ATSEC/PHP4Apache2Windows.html