PHP installation on Roxen Web Server 3.3.63 on Windows XP

Help, someone: I need help with PHP setup on my Windows XP Home Edition, system running Roxen Web Server 3.3.63. I want to run PHP as cgi. I have copied php.exe to my web site's cgi-bin folder, and I have set up the Roxen, Redirect module to point ,php scripts to php.exe as The Roxen freakin' useless manual" says. I always get the dreaded "Internal server error 500 error" when I try to run a php script. Specifically, a form handling script. Also, when I try to set up .php files to be opened by php.exe in my site cgi-bin folder via Folder Options>File Types, or via right-clicking a .php file and selecting "Open With", the association wont work. If I choose php exe in C:\PHP, the association works, but Windows XP will not hold on to the file association after a reboot, for some reason. Obviously, something further needs to be done to set up Roxen to get PHP to work properly. php.ini is in my Windows folder, and php4ts.dll has been copied to the System 32 folder. The Windows 2000 installation instructions for PHP and Roxen are useless. Best Regards, Robert Cameron Ward