PHP INSTALL ON PWS4

Hello, I wondered if you can help? I followed all of the instructions for loading PHP4 on a windows 98 machine running PWS4. When I try to run the test file (test.php) from the root directory of the local web. I get the error message below. I see by going through the bulletin board that it is a very persistant installation problem and should perhaps be a faq. Are you familiar with this and might you be able to help me? HTTP Error 403 403.1 Forbidden: Execute Access Forbidden This error can be caused if you try to execute a CGI, ISAPI, or other executable program from a directory that does not allow programs to be executed. Please contact the Web server's administrator if the problem persists.