PHP files will not execute - IIS 5.1

Greetings, all

I am trying to get PHP working on a non-production machine. I've tried both the manual and automatic installs without success.

Using the automatic installation, when I point my browser to a PHP file, my browser opens a download window instead of opening the PHP file in the browser. This indicates to me that IIS is not even attempting to execute the files.

Using the manual install I attempted using the PHP filter, the application executable for PHP, and both at the same time. All setups returned the page as "This page cannot be displayed"

I have set read&execute permissions for IUSR_server to the PHP directory and the PHP.INI in the Windows directory, and set C:\PHP as a Path variable properly (I can execute php-cgi from any command line directory, so I know this isn't the problem). Currently I have .php set to C:\PHP\php-cgi.exe only in the application mappings section, but have tried unsuccessfully setting it up as an ISAPI filter as well.

Any suggestions?

Thanks in advance.

PHP is working now. I believe after attempting several fixes I just needed to reboot the computer. Unfortunately I'm not sure which specific fix worked, though.