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Choose Start → Administrative Tools → Internet Information Services (IIS) Manager.

The Internet Information Services (IIS) Manager dialog box appears.

If you haven’t already, install PHP Manager for IIS from here. Then you will see it in IIS Manager.

You can install PHP extensions in the “ext” folder under your PHP installation folder. You can also install them through the PHP Manager. 

Make sure you have it pointing to your inetpub/wwwroot

Select your server in the Connections pane of IIS Manager and choose “Default Document.” In the subsequent Actions pane, click “Add…” and add “index.php.” You can also add other files, like “index.php.” This tells IIS to look for such a file, if no file is specified in the URL.