Hello and first question

I have problems running php scripts under w2k. for example, a form to send a mail. I has 3 fields, name, email and msg. The actions goes through POST to a file send.php. In send.php i try to use the variables $name, $email and $msg, but it says they are not declared. The same script works fine under linux. I tried installing apache with php instead of IIS but the same thing happens. I installed the cgi and de module version of php, but the same error occurs. Any sugestions? Chris