Hi,
Don't know if this helps, but i had same problem installing php with Xitami
under Windows... and it was -yes- an unbeliavable incredible minor problem:
I had this in the filter configuration:
[Filter]
.php=F:\PROGRAMAS\PHP\php.exe
and had to change it to:
[Filter]
.php=F:\PROGRA~1\PHP\php.exe
Don't ask me why... but it worked after this minor change.
Regards,
Rui Leite