Make sure your php script mapping is set up properly, first:
Under this folder:
HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\W3SVC\Parameters\Script Map
make a new string var named .php (or .php4, or whatever you want to put as extentions for your php scripts). Then put the path to the script parser in the string, followed by %s %s, like this:
C:\PHP\php.exe %s %s
Depending on which parser you have, you may not need the %s %s.
Also, make sure the virtual web directory you put your scripts in has execute and read access in it.
This worked for me on NT 4 and Win98 with PWS installed. Hope this helps.
-/\/\ike