Hi
It seems that many people have the problem that Apache won't parse PHP files on Win2K when you follow the standard installation instructions. Instead, IE offers you the download of the file and Apache gives you an error message like "Cannot find mod_php4.c" when started.
I found a solution for this problem in another forum which you may find useful:
in httpd.conf:
after the line....
ClearModuleList
add this...
AddModule mod_php4.c
Important: note that the line "AddModule mod_php4.c" has to be added immediately after the line ClearModuleList and not at the end of the list, otherwise it won't work.
Best regards and good luck!