PHP5 installation on Windows XP

I'm trying to install PHP5 on my desktop XP pro machine, which has IIS 5.1. This is because I'm building a web site and I want to include some more sophisticated functionality than I can achieve with just HTML. The site is going to a host which offers PHP5.

I've downloaded the zipped files for PHP5, and followed installation instructions from the web, as well as I can, but it doesn't seem like PHP is working with IIS at all. When I try to navigate to a test file containing just the standard <?php echo Hello World ?> or <?php pfpinfo() ?> firefox thinks I'm trying to download the file, and displays a dialog asking whether I want to open or save it. php -info works fine from a dos prompt though.

I'm not convinced that I have the right files - I don't have something called phpisapi.dll that many installation instructions mention, and I'm confused about whether or not I should be using fastcgi or not. Basically, I don't need any bells or whistles, just a basic PHP installation that will allow me to test my code as I develop it, prior to uploading to the host.

Can anyone help please?

Thanks

Ed

I have windows 7,please help me with installing PHP

just get wamp server or similar. Its a pre-made package with a webserver (apache), database (mysql) and php all pre-configured. You just install. http://www.wampserver.com/en/